Sample Model test 3

历年三级英语真题作文及范文全文共3篇示例，供读者参考篇1Past TEM-8 Essay Questions and Model AnswersAs an English major student, the TEM-8 (Test for English Majors, Band 8) is one of the most important exams I need to take before graduating. The writing section, which includes an essay task, is often considered the biggest challenge. In this essay, I will analyze some past TEM-8 essay prompts and provide model answers to help myself and other students better prepare for this high-stakes test.One recurring topic in past TEM-8 exams is education and learning. For example, the 2019 exam asked students to write an essay discussing "the most important factors in effective language learning." A model answer could go as follows:An effective language learner must possess a mix of personal traits, study habits, and external support systems. From a personal perspective, traits like motivation, discipline, and open-mindedness are crucial. A motivated student will study consistently rather than procrastinating. Discipline allowsfocusing for long periods on challenging tasks like vocabulary memorization. Open-mindedness means not feelingself-conscious about making mistakes, which is inevitable when mastering a new language.Study habits are also vital. Consistent practice across all skills - reading, writing, listening, and speaking - is key. Simply attending classes is insufficient; active engagement through prep work, participation, and regular review is necessary. Moreover, good organizational skills enable creating reasonable study plans and avoiding feeling overwhelmed.Lastly, external support factors into the equation. Having access to quality learning materials, experienced teachers, conversation partners, and an encouraging environment goes a long way. Language institutions, study groups, and technological resources can provide this framework.In essence, effective language learning requires the right mindset, behaviors, and environmental conditions aligned towards the goal. With diligent effort across these areas, any student can make tremendous strides.Another common TEM-8 topic is cultural issues andcross-cultural communication. A sample question could be: "In today's globalized world, what role do you think culturaltraditions should play? Discuss the potential benefits and drawbacks."Cultural traditions have always been an integral part of human civilization, shaping our identities, values, and ways of life. However, as our world becomes increasingly interconnected, we must carefully consider the role these traditions should play amidst rapid globalization. There are merits to preserving our rich cultural heritages, but we must also be open to change and evolution.On the positive side, cultural traditions provide a sense of rootedness, community, and continuity across generations. Celebrating festivals, foods, arts, and rituals connects the present to the past, fostering appreciation for our ancestors' wisdom and legacies. These shared experiences bind people together, cultivating social cohesion and psychological grounding. Additionally, many cultural traditions embody important ethical teachings and environmental philosophies that promote sustainable living.However, we must be discerning about which aspects of traditions to uphold. Certain regressive cultural norms and practices can impede social progress by hindering gender equality, human rights, scientific advancements, or open-mindedexchange of ideas. Blindly adhering to all traditions without reflective evaluation can perpetuate outdated dogmas at odds with modern realities.The ideal approach lies in upholding the positive, enriching elements of cultural traditions that add meaning and wisdom to our lives, while having the courage to relinquish or reform aspects that contradict universal human values. As cultures interact more than ever before, traditions themselves will inevitably evolve through the cross-pollination of diverse perspectives.Maintaining some cultural traditions yet embracing change is important for harmonious cross-cultural relations. When people from different backgrounds can share their traditions respectfully while remaining open to learning from one another, it promotes cooperation, creativity, and conflict resolution in our globalized society.Other potential TEM-8 topics could include the impact of technology, environmental protection, social justice issues, and more. Regardless of the prompt, there are some universal strategies for crafting an effective essay:Understand the core question and ensure your position directly addresses it. Don't stray too far off-topic.Have a clear overarching thesis or main argument that you logically support with reasoned body paragraphs.Use specific examples and details to illustrate key points rather than just generalizations.Consider counterarguments and address them fairly, showing critical thinking.Use appropriate transitions, varied sentence structure, precise vocabulary, and maintain a formal/academic tone.Proofread carefully for errors in grammar, spelling, punctuation, etc.Ultimately, the essay section tests not just English writing ability, but also argumentative skills, depth of thinking, and content knowledge. By understanding common TEM-8 question types, studying model responses, and practicing effective essay techniques, English majors can maximize their chances of success on this important exam. With diligent preparation across all sections, we can demonstrate our proficiency and readiness for future studies or careers requiring advanced English competency.篇2Past TEM-8 Exam Compositions and Model ResponsesAs an English major student about to take the daunting TEM-8 exam, I've spent countless hours poring over past test papers and model compositions. The writing section, which requires us to produce an academic essay within a limited time frame, is often the most challenging part of the exam. In this essay, I will analyze some previous TEM-8 writing prompts, dissect high-scoring sample responses, and share my insights on how to tackle this crucial component effectively.One recurring theme in TEM-8 writing tasks is contemporary social issues. For instance, a 2020 prompt asked test-takers to discuss the pros and cons of social media and its impact on interpersonal relationships. A model response skillfully outlined both the benefits, such as fostering global connectivity, and the drawbacks, like the potential for cyberbullying and addiction. By presenting a balanced perspective and substantiating arguments with relevant examples, the sample essay demonstrated critical thinking and persuasive writing abilities.Another thought-provoking prompt from 2019 centered on environmental protection, asking examinees to propose solutions to mitigate the effects of climate change. An exemplary response highlighted the urgency of the issue, citing scientificdata on rising global temperatures and sea levels. It then provided a multi-pronged approach, advocating for renewable energy adoption, sustainable transportation, and individual lifestyle changes. The essay's logical flow, factual evidence, and actionable recommendations showcased the writer's research skills and command of academic discourse.Culturally relevant topics have also featured prominently in TEM-8 writing tasks. A 2021 prompt invited students to analyze the impact of globalization on preserving local traditions and customs. A high-scoring sample response skillfully navigated this complex issue, acknowledging the homogenizing effects of globalization while emphasizing the importance of cultural preservation efforts. The essay drew upon real-world examples, such as UNESCO's initiatives to safeguard intangible cultural heritage, demonstrating the writer's ability to contextualize abstract concepts.Alongside content and argumentation, language proficiency is a crucial evaluation criterion in the TEM-8 writing section. Model responses excel in employing a wide range of advanced vocabulary, complex sentence structures, and appropriate academic register. For instance, a 2018 sample essay on the ethical implications of artificial intelligence seamlessly integratedtechnical terminology like "machine learning" and "neural networks" while maintaining a formal, scholarly tone.Furthermore, effective organization and coherence are hallmarks of top-scoring TEM-8 essays. Model responses typically feature a clear introduction that outlines the thesis statement and main arguments, well-structured body paragraphs that logically progress from one point to the next, and a concise conclusion that reiterates the central ideas without introducing new information.Preparing for the TEM-8 writing section requires not only mastering academic writing conventions but also developing a strategic approach to time management. During the exam,test-takers have a mere 30 minutes to plan, draft, and revise their essays. Consequently, practicing timed writing exercises is crucial to honing the ability to organize thoughts efficiently, prioritize key points, and produce a polished piece within the allotted timeframe.Moreover, familiarizing oneself with the evaluation rubric can provide valuable insights into the specific criteria assessors use to grade TEM-8 essays. Typical rubrics encompass content and organization, language use, and mechanics (spelling, punctuation, and grammar). Understanding these assessmentcriteria can help writers allocate their time and efforts more effectively during the exam.In conclusion, the TEM-8 writing section presents a formidable challenge for English major students, requiring a combination of critical thinking, academic writing proficiency, and time management skills. By carefully studying past prompts and model responses, aspiring test-takers can gain invaluable insights into the expectations and standards of this high-stakes exam. Consistent practice, coupled with a strategic approach and thorough understanding of the evaluation criteria, can pave the way for success in this crucial component of the TEM-8.篇3Past TEM-8 Exam Writing Tasks and Sample ResponsesAs an English major student, the TEM-8 (Test for English Majors, Band 8) has been looming large in my mind for quite some time. This high-stakes test, often regarded as the "entrance exam" for postgraduate studies or employment opportunities in the field of English language teaching and research, has challenged generations of students with its rigorous writing section. In this essay, I will delve into the nature of the TEM-8 writing tasks, analyze past prompts and sample responses, andoffer my perspectives as a student grappling with this significant assessment.The TEM-8 writing section typically consists of two tasks: a composition and a translation. The composition task requires students to write a well-structured essay on a given topic within a specified word limit, often ranging from 300 to 400 words. These topics are broad in scope, encompassing social, cultural, and philosophical themes that demand critical thinking, logical reasoning, and effective argumentation skills.One notable past prompt asked examinees to discuss the role of technology in education, a subject that resonates deeply with our generation's experience of integrating digital tools into the learning process. Effective responses to this prompt would likely address the potential benefits of technology, such as increased accessibility to information, interactive learning opportunities, and the development of digital literacy skills. However, they would also need to acknowledge the potential drawbacks, such as the risk of overreliance on technology, the digital divide, and the importance of maintaining traditional pedagogical methods alongside technological advancements.Another thought-provoking prompt from a previous TEM-8 exam asked examinees to explore the concept of globalizationand its impact on cultural identity. This topic required a nuanced understanding of the intricate relationship between global interconnectedness and the preservation of diverse cultural traditions. Successful responses would likely acknowledge the homogenizing forces of globalization while also recognizing the resilience of cultural identities and the potential forcross-cultural exchange and understanding.The translation task, on the other hand, assesses students' ability to accurately convey the meaning and tone of a given text from Chinese to English or vice versa. This task demands not only a strong command of both languages but also an understanding of cultural nuances, idiomatic expressions, and stylistic conventions.One memorable translation prompt from a previous TEM-8 exam involved a passage from a renowned Chinese literary work, testing students' ability to preserve the artistic and cultural richness of the original text while rendering it into idiomatic English. Effective responses would need to strike a delicate balance between literal accuracy and literary flair, capturing the essence of the original work while adhering to the conventions of English prose.As I prepare for the TEM-8 writing section, I am keenly aware of the challenges that lie ahead. The prompts demand a level of critical thinking, cultural awareness, and linguistic proficiency that can only be honed through dedicated practice and exposure to exemplary writing samples.To this end, I have diligently analyzed sample responses from past exams, scrutinizing the organizational structures, rhetorical strategies, and language choices employed by successful candidates. These sample responses serve as invaluable guides, illuminating the criteria by which the essays are evaluated and providing insights into the expectations of the examiners.In my study of these samples, I have observed a common thread: coherence, clarity, and concision are paramount. Effective responses are characterized by a clear thesis statement,well-developed body paragraphs that seamlessly transition from one idea to the next, and a compelling conclusion that synthesizes the main arguments while offering thoughtful insights.Moreover, successful responses demonstrate a command of academic English, employing a diverse vocabulary, varying sentence structures, and adhering to the conventions of formalwritten discourse. At the same time, these exemplars exhibit a nuanced understanding of the given topic, drawing upon relevant examples, statistics, and authoritative sources to substantiate their claims.As I continue my preparation, I am mindful of the importance of constant practice and feedback. Writing sample essays, seeking guidance from professors and peers, and engaging in constructive critique sessions have become integral parts of my routine. With each iteration, I strive to refine my writing skills, hone my critical thinking abilities, and develop a deeper appreciation for the art of effective communication.The TEM-8 writing section is not merely a test of linguistic prowess; it is a testament to our ability to navigate complex ideas, synthesize diverse perspectives, and articulate our thoughts with clarity and precision. As daunting as the task may seem, I am reminded that this challenge is an opportunity to showcase the culmination of years of study and intellectual growth.In the end, the true value of the TEM-8 writing section lies not solely in the test scores or the accolades it may bring but in the journey of self-discovery and intellectual exploration that it fosters. By engaging with these prompts and striving to produce thoughtful, well-crafted responses, we cultivate the criticalthinking skills and cross-cultural awareness that will serve us well beyond the confines of the exam room, equipping us to tackle the complexities of an increasingly interconnected world.。

Product： DC Fan motor Model： W40S12BGA5-07Nidec CorporationCreate date Create date：：Mar Mar 282828th th th, , , 20122012NIDEC CORPORATION SHIGA TECHNICAL CENTER BRANCH DALIAN R&D CENTER ApproveCheckCreateDC FAN RELIABILITY TEST REPORTApproved 2012.3.28R.SO Checked 2012.3.28Z.XIA Prepared 2012.3.28Z.LV Q'ty Result Data No.1Test Record5Pass 4028-1S42Life Test200Pass 4028-2S63Low temperature test3Pass4028-3G4Impeller locked test 3Pass 4028-4S45High temperature/Operating Volotage Margin Verification Test6Pass 4028-5G6High temperature/Operating Volotage On/Off Test 6Pass 4028-6S47Humidity Exposure Test6Pass 4028-7G8Vibration Test 6Pass 4028-8G9Mechanical Shock Test6Pass 4028-9G10Mechanical Shock Test4Pass 4028-10U1.Sample condition: operation,2.Low temprature: -40 degree C/ 1hours,3.High temprature: 90 degree C/ 1hours,4.Transition time: 2hour,5.Number of cycle: 300(Test period 600hours)This test report applies to 40×40×28 Series (W40S12BGA5-07).Representative Test Model:W40S12BS4A5-07T03Da) Rated Current, b) Starting Voltage, c) Air Flow, d) Static Pressure, e) Speed 5V, f) Speed 12V, g) Noise, h) Insulation strength, i) Dielectric Strength, j) Burning Test at 70℃ after 168hr, k) Locked Test, l) Output Signal at 25℃, 65%RH 1. Pulse shape: half-sine, 2. Peak acceleration: 980m/s^2(Equivalent 100G), 3.Duration:6ms, Orientation:x,-x,y,-y,z,-z, 3 shocks each orientation(that is a total of 18 shocks)1. Orientation: X, Y, Z(3 axes), 2, Overall RMS=3.2g,3. Frequency(Hz) PSD(G2/HZ)10 0.0420 0.140 0.1800 0.0021000 0.0024. Duration: 2 hours on each,5. Sample condition: non-packing, non-operation Test ConditionTest items 1. Test at 60℃ and rating voltage, 2. Power On/Off Profile, 2. Total cycle:48 cycle for 72 hours 90min/cycle, On(40min)⇒Off(15sec)/On(15sec) at 40mins ⇒Off(10min)a) MTTF, b) L10 Life1. Temperature:60℃, 2, Humidity:90-95%, 3. Duration; 10 Days, 4. Three pcs are in operation(rated voltage); Three pcs are in non-operation.1. Strage all samples at -40℃ for 48hours,2. Fan operating with minimumvoltage(4.0V) at -40℃ for 48 hours, 3.Chage temp. To -10℃ for 48 hours, 4.Start fan with minimum operating(4.0V) at -10℃ and runing for 60 hours.1. Test under 25℃ or romm temperature,2. Input max operating voltage and observe the current value is variate or not for 1 mintue,3. Input rated voltsage(12V),4. Coil temperature should be monitored,5. Cover withcheesecloth, 6. Duration:24 hours, 7. Perform 500Vac/60sec dielectric strength 1. With maximum operating temperature(70℃ ), 2. 3 units is for highest operating voltage(12.6VDC), 3. 3 units is for lowest operating voltage(4.0V),4. If no problem found then continue testing for 72 hours.DC FAN RELIABILITY TEST REPORTData No.4028-1S4Sample Size Data commentItemsUnits 12345a Rated Current [Arms]0.6790.6140.6480.6960.677b Stating Voltage [V]4.8 4.8 4.79 4.79 4.8c Air Flow[m^3/min]0.730.70.720.720.74d Static Pressure [Pa]494.03490.95496.47485.72507.8e Speed 5V [min^-1]43234412439744224359f Speed 12V [min^-1]1791117733176781803717827g Noise[dB(A)]57.556.455.755.956.4hInsulation Strength(※1)-ok ok ok ok ok iuDielectric Strength(※2)-okokokokokjBurning Test at 70℃ after 168 hours Before Units 12345Rated Current [Arms]0.6790.6140.6480.6960.677Speed 12V [min^-1]1791117733176781803717827Noise 12V [dB(A)]57.556.455.755.956.4After 168 hours Units 12345Rated Current [Arms]0.6780.6020.6530.6880.694Speed 12V [min^-1]1789517742175941799317920Noise 12V [dB(A)]57.256.65655.155.9kLocked test BeforeUnits 12345Rated Current [Arms]0.6780.6020.6530.6880.69Speed 12V [min^-1]1789517742175941799317920Noise at 12V [dB(A)]57.256.65655.155.9After 72 hours Units 12345Rated Current [Arms]0.650.6250.6120.6810.632Speed 12V [min^-1]1783717721176391803117779Noise at 12V [dB(A)]56.955.856.156.656.6lOutput Signal－12345Tach Sig.okokokokok※1　10M Ωmin. at 500VDC※2　5mA max. at 500VDC 60Hz 1minTest Item Test RecordResult;No problemThis test report applies to 40×40×28 Series (W40S12BGA5-07).W40S12BS4A5-07T03D -5 pcs Representative Test Model:Test Condition a) Rated Current, b) Starting Voltage, c) Air Flow, d) Static Pressure, e) Speed 5V, f) Speed 12V, g) Noise, h) Insulation strength, i) Dielectric Strength, j) Burning Test at 70℃ after 168hr, k) Locked Test, l) Output Signal at 25℃, 65%RHData No.4028-2S6Sample SizeLife Test: W40S12BS6A5(22000rpm @13.8V), 80℃, n=200pcsRepresentative Test Model:Test ItemLife TestTest Condition a) MTTF, b) L10 Life 200 pcsThis tert report applies to 40×40×28 Series (W40S12BGA5-07).W40S12BS6A5Data No.4028-2HSample SizeRelation between MTBF and L10　Weibull distribution equation is below, Formula (1)MTBF = MTTF = L 10/A　Formula (2)t = 1.036 × MTTF × (B/n)0.91(Life Test Result: No Fail)<Test condition> ※Attached Test Data (See Next page) ・Model: W40S12BS6A5 (22000rpm@13.8V) ・Temperature: 80℃・Test time already passed: 3650 hours MTTF ＝ 3650 / 1.036 × (2.303/200)0.91＝ 204731 hours(@80℃) It is obtained L 10 by using the weibul distribution equation from MTTF of the test.L 10= 204731 × 0.12＝ 24568 hours(@80℃) L 10 life in 40℃ is calculated from test temperature 80℃ with above L 10 calculation result.L 10= 24568 × 1.5{(80-70)/10｝＝ 36852 hours(@70℃) Furthemore, we will consider acceleration of life by the bearing temperature in the motor form above result.ΔT ＝ (Bearing temperature in the motor) - (Ambient temperature)W40S12BS6A5（@13.8V　22000min-1)ΔT1：22.6W40S12BUA5（@12.0V　16000min-1)ΔT2：13.7L 10= 36852 × 1.5{(ΔT1-ΔT2)/10｝= 36852 × 1.5{(22.6-13.7)/10｝= 47965 hours※NIDEC suppose that NIDEC can guarantee L 10 Life@70℃ 44000 hours by above DATA.Result;Weibul chartFactorεt[hours]Configuration CoefficientNumber of Failure Failure ProbabilityPoisson Distribution Factor Test timealready passedNumber of Samplen[pcs]8070 1.53650200Ts[℃]Tu[℃]B Representative Test Model:Test ItemLife TestTest Condition a) MTTF, b) L 10 Life 200 pcsStress/ Elevated TemperatureUnstress TemperatureAcceleration CoefficientNo problemA 200.1 2.3030.12m r αThis tert report applies to 40×40×28 Series (W40S12BGA5-07).W40S12BS6A5DC FAN RELIABILITY TEST REPORTData No.4028-3GSample Size1Strage all samples at -40℃ for 48hours ↓Fan operating with minimum voltage(4.0V) at -40℃ for 48 hours ↓Chage temp. To -10℃ for 48 hours ↓Start fan with minimum operating(4.0V) at -10℃ and runing for 60 hours Before Units123Current 5V [Arms]0.130.130.13Speed 5V [min^-1]596859026150Current 12V [Arms]0.350.350.35Speed 12V [min^-1]143841451714822Noise [dB(A)]50.2250.4250.33After 10 days Units123Current 5V [Arms]0.130.140.13Speed 5V [min^-1]603959296125Current 12V [Arms]0.340.340.35Speed 12V [min^-1]146851467614756Noise [dB(A)]49.2449.449.47※Test data should be measured at room temperature.Representative Test Model:Test Item Low temperature testThis test report applies to 40×40×28 Series (W40S12BGA5-07).W40S12BGA5-53T03ATest Condition 1. Strage all samples at -40℃ for 48hours, 2. Fan operating with minimum voltage(4.0V) at -40℃ for 48 hours, 3.Chage temp. To -10℃ for 48 hours, 4.Start fan with minimum operating(4.0V) at -10℃ and runing for 60 hours.5 pcsResult;No problemData comment W40S12BS4A5 and W40S12BGA5 are same structures, So low temperature test data is substituted by the low temperature test data of W40S12BGA5.1DC FAN RELIABILITY TEST REPORTData No.4028-4S4Sample SizeInput max operating voltage and observe the current value is variate or not for 1 mintue.FAN1FAN2FAN3Coil temperature should be monitoredPerform 500Vac/60sec dielectric strength test after lock tesiting123OKOKOKNo problemDielectric StrengthTest Condition1. Test under 25℃or room temperature, 2. Input maxoperating voltage and observe the current value is variate or not for 1 mintue, 3. Input rated voltsage(12V), 4. Coil temperature should be monitored, 5. Cover with cheesecloth, 6. Duration:24 hours, 7. Perform500Vac/60sec dielectric strength test after lock tesiting.3 pcsResult;Representative Test Model:Test ItemImpeller locked testThis test report applies to 40×40×28 Series (W40S12BGA5-07).W40S12BS4A5-07T03DDC FAN RELIABILITY TEST REPORTData No.4028-5GSample Size 13 units is for highest operating voltage(12.6VDC) at 70℃.Before Units123Current 5V [Arms]0.140.130.13Speed 5V [min^-1]615860316172Current 12V [Arms]0.350.350.35Speed 12V [min^-1]144511448614538Noise [dB(A)]49.6849.3949.83After 10 days Units123Current 5V [Arms]0.130.130.12Speed 5V [min^-1]610260796146Current 12V [Arms]0.350.350.34Speed 12V [min^-1]144361454814412Noise [dB(A)]49.8349.7550.13※Test data should be measured at room temperature.23 units is for lowest operating voltage(4.0V) at 70℃.Before Units123Current 5V [Arms]0.120.130.12Speed 5V [min^-1]604960976194Current 12V [Arms]0.360.350.36Speed 12V [min^-1]145371466714412Noise [dB(A)]49.9949.5649.18After 10 days Units123Current 5V [Arms]0.120.130.12Speed 5V [min^-1]603261316292Current 12V [Arms]0.330.350.35Speed 12V [min^-1]145491468914509Noise [dB(A)]49.9050.1349.95※Test data should be measured at room temperature.Test Condition 1. With maximum operating temperature(70℃ ), 2. 3 units is for highest operating voltage(12.6VDC), 3. 3 units is for lowest operating voltage(4.0V), 4. If no problem found then continue testing for 72 hours.6 pcsResult;No problemData comment1W40S12BS4A5 and W40S12BGA5 are same structures, So High temperature test data is substituted by the High temperature test data of W40S12BGA5.Representative Test Model:Test Item High temperature/ Operating Volotage Margin Verification Test This test report applies to 40×40×28 Series (W40S12BGA5-07).W40S12BGA5-53T03ADC FAN RELIABILITY TEST REPORTData No.4028-6S4Sample Size 1ResultBefore Units 123456Current 12V [Arms]0.6520.6250.6120.6810.6320.638Speed 12V [min^-1]178371772117639180311777917794Noise [dB(A)]57.956.857.1057.657.657.2After Units 123456Current 12V [Arms]0.6280.6310.6260.6430.6120.633Speed 12V [min^-1]177261788917646180301780217842Noise [dB(A)]56.456.756.656.9056.656.7※Test data should be measured at room temperature.W40S12BS4A5-07T03DThis test report applies to 40×40×28 Series (W40S12BGA5-07).No problemRepresentative Test Model:Test Item High temperature/ Operating Volotage On/Off Test Test Condition 1. Test at 60℃ and rating voltage, 2. Power On/Off Profile,2. Total cycle:48 cycle for 72 hours 90min/cycle, On(40min)⇒Off(15sec)/On(15sec) at 40mins ⇒ Off(10min)6 pcsResult;DC FAN RELIABILITY TEST REPORTData No.4028-7GSample Size 1Three pcs are in operation(rated voltage)Before Units123Current 5V [Arms]0.140.140.15Speed 5V [min^-1]583458725904Current 12V [Arms]0.360.350.35Speed 12V [min^-1]144341439414457Noise [dB(A)]49.7549.5349.81After 10 days Units123Current 5V [Arms]0.140.140.14Speed 5V [min^-1]576857595791Current 12V [Arms]0.360.350.36Speed 12V [min^-1]144271432014380Noise [dB(A)]49.3549.0449.49※Test data should be measured at room temperature.2Three pcs are in non-operation.Before Units123Current 5V [Arms]0.130.140.14Speed 5V [min^-1]594560586152Current 12V [Arms]0.360.370.35Speed 12V [min^-1]145871464714407Noise [dB(A)]49.1649.1148.89After 10 days Units123Current 5V [Arms]0.140.140.14Speed 5V [min^-1]609560956212Current 12V [Arms]0.360.360.35Speed 12V [min^-1]147321469514408Noise [dB(A)]49.6849.3549.04※Test data should be measured at room temperature.Test Condition 1. Temperature:60℃, 2, Humidity:90-95%, 3. Duration; 10Days, 4. Three pcs are in operation(rated voltage); Three pcs are in non-operation.6 pcsResult;No problemData comment1W40S12BS4A5 and W40S12BGA5 are same structures, So Humidity exposure test data is substituted by the Humidity exposure data of W40S12BGA5.Representative Test Model:Test Item Humidity Exposure TestThis test report applies to 40×40×28 Series (W40S12BGA5-07).W40S12BGA5-53T03ADC FAN RELIABILITY TEST REPORTData No.4028-8GSample Size 1Result Before Units123456Current 5V [Arms]0.150.140.130.130.140.13Speed 5V [min^-1]608960546124643260756154Current 12V [Arms]0.370.340.360.360.360.36Speed 12V [min^-1]145811437714288144221433414418Noise [dB(A)]49.5849.4850.1349.8349.3149.68After Units123456Current 5V [Arms]0.140.140.130.130.140.13Speed 5V [min^-1]592261346432642261326289Current 12V [Arms]0.340.350.350.350.340.36Speed 12V [min^-1]144011464914663142891435314662Noise [dB(A)]50.1549.7749.6349.9649.3749.97Out-Line Visual -OK OK OKOK OK OK※Test data should be measured at room temperature.This test report applies to 40×40×28 Series (W40S12BGA5-07).W40S12BGA5-53T03ANo problemRepresentative Test Model:Test ItemVibration TestTest Condition1. Orientation: X, Y, Z(3 axes), 2, Overall RMS=3.2g,3. Frequency(Hz) PSD(G2/HZ)10 0.0420 0.140 0.1800 0.0021000 0.0024. Duration: 2 hours on each,5. Sample condition: non-packing, non-operation 6 pcsResult;Data comment1W40S12BS4A5 and W40S12BGA5 are same structures, So Vibration test data is substituted by the Vibration test data of W40S12BGA5.DC FAN RELIABILITY TEST REPORTData No.4028-9GSample Size 1Result Before Units123456Current 5V [Arms]0.120.130.130.130.130.12Speed 5V [min^-1]591460876072602462746168Current 12V [Arms]0.370.360.380.350.360.37Speed 12V [min^-1]144151463014490143521465114102Noise [dB(A)]49.6449.6049.3449.6150.5649.91After Units123456Current 5V [Arms]0.120.130.130.140.130.13Speed 5V [min^-1]592261646137614963336491Current 12V [Arms]0.350.350.360.340.360.33Speed 12V [min^-1]145281470014532144901467014412Noise [dB(A)]49.9150.0649.6249.2950.1849.59Out-Line Visual -OK OK OKOK OK OK※Test data should be measured at room temperature.This test report applies to 40×40×28 Series (W40S12BGA5-07).W40S12BGA5-53T03ANo problemRepresentative Test Model:Test Item Mechanical Shock TestTest Condition 1. Pulse shape: half-sine, 2. Peak acceleration:980m/s^2(Equivalent 100G), 3. Duration:6ms, Orientation:x,-x,y,-y,z,-z, 3 shocks each orientation(that is a total of 18shocks)6 pcsResult;Data comment1W40S12BS4A5 and W40S12BGA5 are same structures, So Mechanical shock test data is substituted by the Mechanicalshock test data of W40S12BGA5.DC FAN RELIABILITY TEST REPORTData No.4028-10USample Size 1Result Before Units 1234Current 12V [Arms]0.460.440.450.46Speed 12V [min^-1]16223163081635516448Noise [dB(A)]52.653.2053.2652.86After Units 1234Current 12V [Arms]0.4650.4460.4630.474Speed 12V [min^-1]16222162941635016411Noise [dB(A)]52.9653.1252.4753.34Out-Line Visual -OK OK OKOK※Test data should be measured at room temperature.Data comment1W40S12BS4A5 and W40S12BUA5 are same structures, So Mechanical shock test data is substituted by the Mechanicalshock test data of W40S12BUA5.This test report applies to 40×40×28 Series (W40S12BGA5-07).W40S12BUA5-02Z01No problemRepresentative Test Model:Test Item Thermal Cycling TestTest Condition 1.Sample condition: operation,2.Low temprature: -40 degree C/ 1hours,3.High temprature: 90 degree C/1hours,4.Transition time: 2hour,5.Number of cycle: 300(Test period 600hours)4 pcsResult;。

C-3 Cable Bending TestTest ResultsImplementationDate (DD/MM/YY)/ / Judgement OK • NGModel Name Approved by Checked by Prepared by Number ofTest SampleTest Sample DVT • PVT • MP • Other( )Test Standards◆Recommended Test Facilities and SoftwareCable bending tester◆Test Environment ConditionsNormal temperature 25 ± 5 ︒CNormal humidity 20 to 80%◆Test Samples3pieces of cable of which severe tests have not been conducted.◆Test MethodFix a sample cable with an appropriate length in the tester illustrated in Fig. 1 in the next page. Attach a 0.5kg plumb.Bend the sample cable 90 degrees right and left in a direction perpendicular to the conductor axial direction, and in a direction parallel to the conductor axial direction.Bend the sample cable 30 times per minute, where one time represents 180-degree bending.Bend the sample cable at the bushing section and the cable section illustrated in Fig. 2.If the two bushing sections are attached to the same connectors, bend the sample cable at one of the two bushing sections.Section Flex radius Mass of weight Flex velocity Cable body 2 times of cable wire diameter0.5kg 30cycles/minBushing Free or less than 2.5mmFig. 1 : Cable Bending TesterCable Body sectionBushing sectionFig. 2 : The bending test positionsAcceptance CriteriaThe cable shall not have a break after the cable bending test.And, the tear shall not occur in cable skin & the bushing.Flexing cycles classA: 2000 cyclesB: 1500 cyclesC: 1000 cyclesD: 500 cyclesCable bushing Cable bushing Cable wire Flex radiusWeight1 cyclea >b > a >c > aParallel Direction Perpendicular DirectionComments* This test is applicable to detachable signal cables from product.* If the cable will be used in Business Solution product, Acceptance Criteria should be strict than “B” rank.。

训练集测试集验证集英文The Importance of Training, Testing, and ValidationSets in Machine Learning.In the field of machine learning, the division of data into training, testing, and validation sets is crucial for ensuring the effective development and evaluation of models. Each set serves a distinct purpose in the machine learning workflow, and their integration is essential for achieving accurate and reliable results.Training Set.The training set is used to teach the machine learning model how to perform a specific task. It contains a subsetof labeled data, which the model uses to learn the underlying patterns and relationships between inputs and outputs. The model's parameters are adjusted based on the training data to minimize a predefined loss function, which measures the difference between the model's predictions andthe actual labels.During the training phase, the model's goal is to fit the training data as well as possible. However, it'scrucial to avoid overfitting, where the model performs poorly on new, unseen data because it has learned the noise or irrelevant details in the training set. To mitigate this issue, techniques such as regularization and dropout are often employed.Validation Set.The validation set serves as a middle ground between the training set and the testing set. It's used to evaluate the model's performance during the training process, allowing for adjustments to be made without corrupting the test set's integrity. The validation set helps in hyperparameter tuning, model selection, and early stopping to prevent overfitting.By monitoring the model's performance on the validation set, practitioners can assess how well it generalizes tounseen data. If the model's performance on the validation set stops improving, it's a signal to stop training to prevent overfitting. The validation set also allows for comparisons between different models or algorithms, enabling practitioners to choose the best-performing one.Testing Set.The testing set is used to assess the final performance of the trained model on unseen data. It's crucial to evaluate the model's performance on data it hasn't encountered during training or validation to ensure its generalization capabilities. The testing set should be completely separate from the training and validation sets and only used once at the end of the machine learning workflow.By comparing the model's predictions on the testing set to the actual labels, practitioners can calculate evaluation metrics such as accuracy, precision, recall, and F1 score. These metrics provide a quantitative measure of the model's performance and allow for comparisons withother models or benchmarks.Conclusion.The division of data into training, testing, and validation sets is fundamental to the success of machine learning projects. The training set teaches the model, the validation set helps in tuning and evaluating the model during training, and the testing set provides an unbiased assessment of the model's final performance. By leveraging these sets effectively, practitioners can develop accurate, robust, and reliable machine learning models that generalize well to new, unseen data.。

第1篇一、实验背景随着大数据时代的到来，机器学习技术在各个领域得到了广泛应用。

本实验旨在通过实际操作，掌握机器学习建模的基本流程，包括数据预处理、特征选择、模型选择、模型训练和模型评估等步骤。

通过实验，我们将深入理解不同机器学习算法的原理和应用，提高解决实际问题的能力。

二、实验目标1. 熟悉Python编程语言，掌握机器学习相关库的使用，如scikit-learn、pandas等。

2. 掌握数据预处理、特征选择、模型选择、模型训练和模型评估等机器学习建模的基本步骤。

3. 熟悉常见机器学习算法，如线性回归、逻辑回归、决策树、支持向量机、K最近邻等。

4. 能够根据实际问题选择合适的机器学习算法，并优化模型参数，提高模型性能。

三、实验环境1. 操作系统：Windows 102. 编程语言：Python3.83. 机器学习库：scikit-learn 0.24.2、pandas 1.3.4四、实验数据本实验使用鸢尾花数据集（Iris dataset），该数据集包含150个样本，每个样本有4个特征（花瓣长度、花瓣宽度、花萼长度、花萼宽度）和1个标签（类别），共有3个类别。

五、实验步骤1. 数据导入与预处理首先，使用pandas库导入鸢尾花数据集，并对数据进行初步查看。

然后，对数据进行标准化处理，将特征值缩放到[0, 1]范围内。

```pythonimport pandas as pdfrom sklearn import datasets导入鸢尾花数据集iris = datasets.load_iris()X = iris.datay = iris.target标准化处理from sklearn.preprocessing import StandardScalerscaler = StandardScaler()X = scaler.fit_transform(X)```2. 特征选择使用特征重要性方法进行特征选择，选择与标签相关性较高的特征。

Band Four 183Key to Model Test (3) Band FourPart I. WritingSample Writing:When asked about the relation between love and study on campus, different peoplewill offer different opinions. Some people take it for granted that college studentsshould not fall in love with each other in order to waste their precious time. In theiropinion, love is time-consuming and will distract one’s attention from learning. Besides,they think that if a student falls in love, he will certainly fall behind in his study. However, others hold that love on campus may encourage students to study harder.They maintain that a true love will never stand aside while another falls behind in hisor her study. And most love stories on campus are developed on the basis of mutual helpin study.Weighing up these two arguments, I am for the second one. For one thing, mutualhelp in life is certainly a strong support in study. For another, true lovers usually helpeach other both in life and study. Therefore, if guided properly, love will be helpful tothe study.Part II. Reading Comprehension (Skimming and scanning)1. Y [解释] 快速浏览全文黑体字标题，可知，全文都是作者给家长提出的一些建议。

贝叶斯法构建系统发育树1.打开PAUP软件，打开目标文件和primates文件，将目标文件修改成primates文件格式。

2. 用modeltest3.7软件分析模型参数。

3. 打开mrbayes软件，文件输入。

命令：>execute 文件名.nex4. 设置参数，模型（上面modeltest3.7软件分析模型参数）。

命令：>lset nst＝6/2 rates ＝gamma/invgamma/propinv,若要检查模型的参数，输入命令showmodel。

若设定lset nst＝2，需输入命令report tratio＝dirichlet。

3.1 >mcmc ngen=100000(1000000) (samplefreq=10(100)),注意：代数可以先设为10000，以便估计时间的长短。

>help mcmc来确认设置。

3.2 运行结束前，标准误差要小于0.01,否则增加代数，继续运行4.1 >sump burnin=250(2500);抽样的25％划为老化样本，舍去。

PSRF值需约等于1.0,否则要运行更长时间。

4.2 >sumt burnin=250(2500),输出所得的进化树，可用treeview打开.Modeltest 3.7基本操作步骤（中文）Moedltest是进行似然法计算必须的软件之一，它可以帮助大家为所获数据选择最佳的模型进行计算，得到最优的结果。

目前该软件的这里介绍一下Modeltest3.7的基本操作步骤：1. 下载Modeltest3.7软件和模型文件modelblockPAUPb10.txt；2. 将序列同源排序后保存为XXX.nex文件；全部拷贝到C盘。

3. 打开模型文件，将文件内容拷贝到XXX.nex文件的末尾，可以将该文件另存为XXX.test.model.nex，保留原来的*.nex文件；；4. 打开PAUP4.0应用程序，将XXX.test.model.nex文件拖入PAUP窗口，然后在命令行输入：execute XXX.test.model.nex，回车后PAUP就开始对数据进行模型估计，结果将保存为model.scores文件和modelfit两个文件，文件位于PAUP4.0软件的文件夹中；5. 将model.scores文件拷贝到Modeltest3.7.win.exe所在的文件夹中。