4ch3wind风4hr

HRS-PF001, HRS-PF002Applicable model: HRS SeriesRead before using.Thank you for purchasing SMC’s Thermo -chiller.This particle filter set is a set of parts for installing a particle filter into the piping used in the thermo-chiller HRS series.Read and understand the instructions shown below before use.Safety InstructionsSafety first, only trained personnel who has knowledge of general machinery and equipment can perform the installation of this product.Ensure this manual and the Operation Manuals for thermo-chiller are fully understood.Disconnect power from the chiller before performing product installation. Be sure to check that the power supply is shut off.Remove all circulating fluid before performing product installation.Confirm that there is no fluid leakage or condensation after installation.1. Parts and AccessoriesThis particle filter set includes the following parts.Please confirm that all of them are present before beginning installation.Parts[Materials of wetted parts]Stainless Steel, PTFE, PP , Acrylonitrile-styrene, NBR (PE: Element)2. Mounting1) Confirm that no foreign matter such as dust or dirt is adhered to the connectingport or piping.2) Apply the sealant tape (7) to the nipple (4). Mount the nipple (4) to the inlet of theresin filter case (1).Apply the sealant tape to the extension piece (5). Mount the extension piece (5)to the outlet of the resin filter case (1).CautionApply the sealant tape on the NPT side of the nipple 4 turns.3) Remove the cover of the filter case (1). Mount the nipple (4) (which is mounted inprocedure 2) to the circulating fluid outlet at the back of the thermo-chiller4) Loosen the M5 screws at the back of the thermo-chiller panel. Mount the particlefilter bracket (3). Using tapping screws (8), mount the particle filter bracket to theresin filter case (1)). After mounting the particle filter bracket, tighten the M5 screws on the back of the thermo-chiller panel.Use a long screwdriver for tightening the M5 screws.5) Insert the element (2) into the resin filter case (1). Mount the resin filter case byhand tighten.Cautionshould be 6) After mounting the fitting, operate the thermo-chiller to check that liquid does notleak.3. Related productsBypass piping set [Part No: HRS-BP001]CautionUse in combination with the DI Filter Set (HRS-DP001) is not possible.(For "-H")(PTxNPT)(NPTxPT)7. Sealant tape 9. Operation munual (This manual)6. Handle8. Cross recessed head tapping screw 1. Resin filter case 2. Element 3. Particle filter bracket 4. Nipple 5. Extension piece [For HRS-PF001][For HRS-PF002][For HRS-PF001]　For "-W005"　Model: EJ202S-005X11　For "-W075"　Model: EJ202S-075X11[For HRS-PF002]　For "-W005"　Model: EJ302S-005X11　For "-W075"　Model: EJ302S-075X11No.HRX-OM-Q040-GMountingAssembled unit[HRS-PF001][HRS-PF002] [HRS-PF001][HRS-PF002]4 pieces *The element should be replaced when thepressure drop reaches 0.1MPa. *Use this handle only toloosen the case. Do not useto tighten the case.。

四氢呋喃四氢呋喃是一类杂环有机化合物。

它是最强的极性醚类之一，无色易挥发液体，有类似乙醚的气味。

溶于水、乙醇、乙醚、丙酮、苯等多数有机溶剂。

简称THF ，分子式为C4H8O ，沸点为66℃，比重D ２０ ４0.886~0.888，折光率n20 D1.4060~1.4080。

由于其具有溶解速度快、扩散性能好、流动性好、低毒、低沸点等特点，对有机物和无机物均有良好的溶解性能，素有“万能溶剂”之称，可用在树脂、聚醚橡胶和聚氨酯合成中作溶剂。

中文名：四氢呋喃 外文名：tetrahydrofuran 分子式： C4H8O相对分子质量：72.11 化学品类别： 有机物 管制类型： 不管制 储存： 密封保存CAS 编号： 109-99-9其他名称： 1,4-环氧丁烷；氧杂环戊烷；氧戊环物理性质四氢呋喃结构式外观与性状：无色易挥发液体，有类似乙醚的气味。

熔点(℃)：-108.5 ； 相对密度（水=1）：0.89 ； 沸点(℃)：65.4 ；相对蒸气密度（空气=1）：2.5 ； 分子式：C4H8O ； 分子量：72.11 ；饱和蒸气压(kPa)：15.20(15℃) ； 临界温度(℃)：268 ； 临界压力(MPa)：5.19闪点(℃)：-20 ；爆炸上限%(V/V)：12.4 ；引燃温度(℃)：230 ； 爆炸下限%(V/V)：1.5 ； 溶解性：溶于水、乙醇、乙醚、丙酮、苯等多数有机溶剂。

[2]化学性质在加压下与氯化氢作用生成1,4-二氯丁烷。

易燃，与氢氧化钠、氢氢化钾反应强烈。

与酸接触能发生反应，不加稳定剂暴露在空气中能形成有爆炸性的过氧化物。

蒸气能与空气形成爆炸性混合物，爆炸极限2．3%-11．85%(vol)。

由于四氢呋喃中氧原子配位能力很强，并且沸点较高，故可以用于合成格氏试剂（氯苯，氯乙烯和镁只有在四氢呋喃中才能生成格氏试剂），有机锂试剂（但能被游离的叔丁基锂分解，故游离的叔丁基锂只有在环己烷，石油醚中才稳定存在）。

PROFESSIONNAL WEATHER STATION- Instruction Manual -1/ FUNCTION DESCRIPTION5 kinds of weather forecast, BAR display in dynamic curve, pressure measurement, history record and trend display of pressure in the past 12 hoursMax/min value of indoor temperature and humidityFive channels in total. Three channels for outdoor temperature and humidity, one for wind speed and direction, and the other for rainfall. Max/ min value and trend of outdoor wireless temperature and humidity.Real-time outdoor wireless wind speed and direction, the average of wind speed, wind trend and max and min value of the wind information. Outdoor heat index, dew point, chill coefficient.Display the rainfall of current day; the current rainfall rate; Record of the past 1 hour, 24hours, 1 week and 1 month. Perpetual calendar with moon phase, RCC DCF Alarm, backlight, snooze2/ MAIN FUNCTION12 functional keys: -/RCC 、+/℃/℉、MODE 、CHANNEL 、MAX/MIN 、SNOOZE/LIGHT 、ALERT 、HISTORY 、RAINFALL 、ALARM ON/OFF 、HI/DP/CHILL 、WIND. Automatically clock receiving (DCF) Daylight saving time.Time and perpetual calendar displaying. Two time format to be selected 12/24 hr. Single alarm, five minutes snooze function.Two temperature display format options (℃ / ℉). Indoor temperature and humidity displaying.Range of indoor temperature testing: -10℃~ 60℃ (14 ℉ ~ 140℉) testing cycle: 30 seconds Range of indoor humidity testing: 20% ~ 95%.Max and min values of Indoor temperature and humidity.Three different wireless channels work together for three sets receiving of outdoor temperature and humidity. Range of temperature testing: -40 ℉ ~ 158 ℉; Testing cycle: about 1 minute.The max and min of outdoor temperature and humidity.The up and low limit of indoor and outdoor temperature alarm. Indoor/ outdoor temperature trend.Range of outdoor wind speed and direction testing: 00KM/Hr ~ 150KM/Hr, 16 wind directions index.The average wind speed, max and min record and / trend of wind speed.The average and real-time wind speed display.RF outdoor rainfall detection.Rainfall display: total rainfall of the day, current rainfall rate, rainfall of the past 1 hour &24 hours, 1 week and Last monthUnit to select: mm (/ h) or inch (/ h).Calculate of outdoor Dew point, Heart index and Wind chill.5 kinds of weather forecast: sunny, semi-sunny, cloudy, rainy and stormy.Atmospheric pressure unit selection: mb / hpa or inHg.Record of atmospheric pressure changes in the past 12-hour.BAR display of the atmospheric pressure in the past 12-hour.Moon phase calculate.Receiver can display low power index of 4 parts: Receiver, temperature sensor , wind speed sensor , rainfall sensor.LED backlight.3/ P OWER AND RESETAfter put on the battery, LCD will display three seconds with a sound of BI at the sametime, start detecting temperature humidity and pressure inside the sensor, and then automatically enter the RF and RCC receiving. RCC receiving for 7 minutes, exit after received or press "-/RCC" key to exit.Perpetual calendar defaults to 1 January, 2009 0: 00.Alarm default (AM) 7:00.The time format default for 24 hr.Default temperature unit (DCF): ℃.Default weather symbol: cloudy.Default pressure unit is hpa mBar.Default rainfall unit is mm (mm/hr).4/ OPERATION4.1/ KEY FUNCTIONS4.2.1/ MODEIn normal mode, press MODE once to check ALARM, DST; Hold to enter time setting mode.In alarm mode, hold to enter alarm setting.4.2.2/ ALARMIn normal mode or alarm mode, press ALARM ON/OFF key to on/off alarm.4.2.3/ +/C/FWhen setting, press +/℃/℉once to adjust by one step (ahead), hold more than 2 seconds to adjust fast by 8 steps/ second.In normal mode, press to switch between ℃/℉4.2.4/ -/RCCIn setting mode, press -/RCC to adjust by one step (back), hold more than 2 seconds to adjust fast by 8 step/second.In normal mode, press to switch the ZONE OFFSET +1 →+2 →-1→normal.In normal mode, Hold more than 2 second force into RCC receiving mode, press again to exit.4.2.5/ HI/DPSwitch among HEATINDEX、DEWPOINT and WINDCHILL4.2.6/ SNOOZEIn normal mode, press SNOOZE to light for 5 seconds.When alarm, press SNOOZE key stop alarm and into five minutes snooze mode.4.2.7/ CHANNELIn normal mode, press CHANNEL to switch RF channels CH1 --> CH2--> CH3 -->cycle display.In normal mode, press CHANNEL key longer than 2 seconds, clear all outdoor channel records (outdoor temperature and humidity, wind speed, rainfall).Channel set in the ALERT mode, select the channel settings.4.2.8/ RAINFALLIn normal mode, press RAINFALL to switch among the current rainfall rate, the rainfall in the past 1 hour, past 24 hours, past 1 week and past a month. Press again to back to rainfall display of current day.4.2.9/ ALERTIn normal mode, press ALERT once to on/off temperature alarm.In normal mode, hold ALERT more than two seconds to enter temperature alarm setting.In temperature alarm setting mode, press ALERT to confirm setting item.4.2.10/ HISTORYIn normal mode, press once to check pressure record in the past 12 hours，hold for more than two seconds into relative pressure setting.Setting order:Select LOCAL → weather state setting → unit setting (mb hpa or inHg) →exit.Select SEA LEVEL → weather state setting → unit setting (mb hpa or inHg) → sealevel setting →exit.4.2.11/ WINDHold more than two seconds into wind speed setting, press "+/℃/℉" or "-/RCC" to select unit and to set average wind speed.4.2.12/ MAX / MINPress MAX / MIN to check the max value of indoor and outdoor temperature humidity and wind speed. The display will continue for 20 seconds if without pressing any key.Press again to check the min value, the display will continue for 20 seconds. Press again back to normal display.When display max or min, hold MAX / MIN for 2 seconds to clear the present memory of max/min value and then back to the normal display mode.4.3/ TIME SETTINGIn normal mode, hold ”MODE for more than 2 seconds into time setting.Time setting order: hour→ minute →year（2000-2099 year）→month date / date month→12/24H → exitThe setting item will twinkling at a frequency of 1HZ.Press MODE to confirm the setting and turn to next setting item.Press “+/℃/℉”once to ahead one step, hold m ore than 2 seconds to ahead by 8 steps/ second.Press “-/RCC”once to back one step, hold more than 2 seconds to back by 8 steps/ second.Without any effective handling more than 20 seconds, will exit setting automatically.4.4/ ALARM SETTING1. Hold MODE more than into ALARM setting.2. Setting order: ALARM hour→ ALARM minute →exit.3. When setting, the setting item will twinkling at a frequency of 1HZ.4. Press MODE to confirm the setting item and turn to next setting.5. Press “+/℃/℉”once to ahead one step, hold more than 2 seconds to ahead by 8 steps/ second.6. Press “-/RCC”once to back one step, hold more than 2 seconds to back by 8 steps/ second.7. Without any effective handling more than 20 seconds, will exit setting automatically.8. When into alarm setting, the alarm will be on automatically.4.5/ TEMPERATURE ALERT SETTINGPress “ALERT” to on/ off temperature alert.Hold “ALERT” more than 2 seconds into alert setting.Setting order: upper limit→lower limit →exit, in the setting mode, press CHANNEL to select the channel of outdoor temperature alert.Default upper limit of indoor temperature is 60°C (122 °F) and outdoor temperature is 70°C (158 °F) , the lower limit is: indoor -10°C (14 °F), outdoor -40°C(-40 °F). When setting, the setting item will twinkling at a frequency of 1HZ.Press “ALERT” to confirm setting item and turn to next setting.Press “+/°C/°F”once to ahead one step, hold more than 2 seconds to ahead by 8 steps/ second.Press “-/RCC”once to back one step, hol d more than 2 seconds to back by 8 steps/ second.Without any effective handling more than 20 seconds, will exit setting automatically.When into alert setting, the alert will be on automatically.4.6/PRESSURE SETTINGSIn normal mode, press “HISTORY” once to check record of pressure in the past 12 hours.Hold “HISTORY” more than 2 seconds into relative setting of weather.Setting order:Select LOCAL →weather state →unit option (mb hpa or inHg) →exit.Select SEA LEVEL → weather state → unit option (mb hpa or inHg) → sealevel setting →exit.When setting, the setting item will twinkling at a frequency of 1HZ.Press “HISTORY”to confirm setting item and turn to next setting.Press “+/°C/°F”once to ahead one step, hold more than 2 seconds to ahead by 8 steps/ sec ond.Press “-/RCC”once to back one step, hold more than 2 seconds to back by 8 steps/ second.Without any effective handling more than 20 seconds, will exit setting automatically.4.7/ WIDE SPEED SETTINGHold “WIND”more than 2 into wind relative setting.Setting order: select unit→ time of average wind speed→exit.When setting, the setting item will twinkling at a frequency of 1HZ.Press “Wind” to confirm setting item and turn to next setting.When setting unite, press “+/°C/°F ”or“-/RCC” to select m/s、Km/h、mph、knotsWhen in time setting o f average wind speed, press “+/°C/°F”once to ahead one step, hold more than 2 seconds to ahead by 8 steps/ second.When in time setting of average wind speed, press “-/RCC”once to back one step, hold more than 2 second s to back by 8 steps/ second.Without any effective handling more than 20 seconds, will exit setting automatically.4.8/ RAINFALL SETTINGHold “RAINFALL” more than 2 seconds into rainfall setting.When setting, the setting item will twinkling at a frequency of 1HZ.When in unit setting, press “+/°C/°F”or“-/RCC” to select INCH, MM.Press “RAINFALL” or without any effective handling more than 20 seconds, w ill exit setting automatically.5/ FUNCTION AND EFFECT5.1/ RF RECEIVINGWhen power on, it will automatically into RF receive for 3 minutes after temperature and humidity testing. 3 minutes later into RCC receiving.In normal mode, press Channel more than 2 seconds to force clear all registration information of channelsIf the registered CH temperature does not receive any effective signals from the same ID Code in 60 minutes, the CH temperature will display twinkling. If the wind speed does not receive any effective signals from the same ID Code in 60 minutes, it will display twinkling.If the rainfall does not receive any effective signals from the same ID Code in 60 minutes, it will display twinkling.When the information of temperature / wind speed / rainfall lost, it will return to display after receive the signal again.5.2/ RCC RECEIVING FUNCTIONSEnter the RCC receiving conditions:⏹When change the battery or reset to enter RCC receiving.⏹Automatically receiving RCC at 2:03, 3:03, 4:03, and 5:03 everyday.⏹Press “RCC ” 2 seconds receive the RCC receiving comely.RCC receiving time is 7 minutes.Symbol of RCC receiving:When into RCC receiving, the tower-like RCC symbol will twinkling at a 1HZ frequency.⏹When received signals successfully, RCC receiving symbol will display fully and exit receiving mode.⏹When successfully received signal, the sign of the RCC display quiescence and exit the receiving modeWhen RCC receiving, there are no functions of other keys. Press "-/RCC" will exit receiving modeIf failed to receive present-day, time for receiving next day is 2:03 a.m..When in RCC receiving, exit RCC receiving and turn into alarm when alerting.DST symbol on LCD displays when received DST signals. RCC & DST symbol disappears after resetting time when RCC & DST symbol displaying.5.3/ ALARM FUNCTIONBUZZER alarm for 2 minutes and alarm mode as belowa.0-8 seconds: beep once every secondb.9-22 seconds: beep twice each secondc.23-56 seconds: beep four times each secondd.57-120 seconds, serial beep.When alarming, press SNOOZE and prolong for 5 minutes, press other keys to exit.5.4/ TEMPERATURE AND HUMIDITY FUNCTIONSIndoor temperature scope: -10°C ~ +60°C (14°F ~ +140 °F).Humidity detection scope: 20% ~ 95%.Outdoor temperature display scope: -40°C ~ +70°C (-40°F ~ +158°F).Detecting indoor temperature cycle: 30 seconds.Temperature testing accuracy: +/-1°C when in 0°C～50°C (32 °F ~ +122 °F),+/-1.5 °C when in -10°C～0°C(14 °F ~ +32 °F) and 50°F～60°F(122 °F ~ +140 °F).It will stop testing when in alarming or in RCC receiving.5.5/ TEMPERATURE ALARM FUNCTIONDefault upper limit of indoor temperature is 60°C and outdoor temperature is 70°C ,the lower limit is: indoor -10°C, outdoor -40°C.When alarming, relative temperature and alarming symbol is twinklingTemperature alarm buzzers:⏹Continue alarming 4 Bi per second.⏹Stop until the conditions meets alarm.Stop alarm conditions:⏹Press any key to stop the temperature alarming, alarm again the next minute.⏹Stop alarming when the temperature back to the range of setting temperature.5.6/ FORECAST AND PRESSUREPressure units: Hpa / Mb or InHg.5 kinds of weather forecast.Temperature, humidity and wind speed display.Past 12 hours pressure data record.Past 12 hours BAR pressure chart display.5.7/ OUTDOOR WIND CHILL HEAT INDEX AND DEW POINTAutomatically calculate the channels of outdoor Wind Chill, Heat Index and Dew Point value.According to outdoor temperature and Wind speed to calculated Wind Chill value; Display the current value when temperature higher than 4.4°C (40°F) According to outdoor humidity and temperature to calculated Heat Index value; Display the current value when temperature lower than 4.4°C (40°F) According to outdoor humidity and temperature to calculated Dew Point value5.8/ WIND SPEED AND WIND DIRECTION16 levels of wind directionGust show.Display the average wind speed of user-defined (1-19 minutes average wind speed adjustable).The trend of the average wind speed.Unit: M / S, KM / H, MPH, Knot.When the anemometer reset, adjust the wind vane to the north of compass manually, then press the TX button inside the wind cup.5.9/ RAINFALLRainfall unite: mm (/ h) or inch (/ h)Intraday rainfall.The current rainfall rate.Total rainfall of 1 past hour.Total rainfall of 24 past hours.Total rainfall of 1 past week.Total rainfall of 1 past month6/ DETAILS AND PRECAUTIONS ON THE USE OF BATTERIES- Discard a used battery in nature or garbage pollutes and prevents the recovery of recyclable materials.It is therefore important to limit consumption of batteries and follow these guidelines:focus on alkaline batteries (that last longer than the saline batteries) and when possible, rechargeable batteriesdeposit batteries and accumulators in specific containers arranged among traders.For example, metals will be valued and polluted the environment because they contain heavy metals hazardous to health and the environment primarily (cadmium and nickel)- The piles must installation by respecting the polarity indicated on the apparatus and the pile.An incorrect positioning can is to damage the apparatus, is to cause escapes on the level of the pile, is to the extreme to cause a fire or the explosion of the pile.- To ensure proper operation, the batteries must be in good condition. In case of abnormality in the functioning of the device, put fresh batteries- Never attempt to recharge non-rechargeable batteries. They could run, warm up, causing a fire or explosion.- Replace all batteries at the same time. Never mix zinc batteries with alkaline batteries or rechargeable batteries- The batteries must be removed from the device- Also, remove the batteries from your device if you do not use it for a long time, if the batteries may leak and cause damage.- Never try to short-circuit the battery terminals- Never dispose of batteries in fire, they might explode- Charging of batteries is to be performed by an adult.- Remove batteries from the device before reloading.- We recommend an adult to supervise children when they change the batteries so that these instructions are complied with or to make himself the replacement of batteries.- If a battery is swallowed, immediately consult a doctor or poison control center nearest you. Do not forget to carry the product with you.- Fix the anemometer as shown on the picture 2, then install 2 AA batteries.- Push the wind vane towards the true north, based on the indication of the compass on the wind vane.- Check that the wind vane is correctly oriented, then press on the button "TX" (picture 4): the system will consider this direction as being the default true north (picture 3).- Each time you replace the batteries of the anemometer, or you change the location, check through the method above that the wind vane is correctly oriented towards the true north.。

人教版四年级上册英语单词拼写培优补差专项班级：_____________ 姓名：_____________【单词拼写】1. 根据中文意思，完成下列单词拼写。

（1）th s 那些（2）h d头（3）m th嘴巴（4）w it 男服务员（5）n w新的（6）fr nd朋友（7）gr df th 爷爷（8）nur 护士（9）c k厨师（10）t ch 教师2. 按要求写单词。

（1）she (形容词性物主代词) ___________（2）sock (复数) ___________（3）long (反义词) ___________（4）my (人称代词主格) ___________（5）brother (对应词) ___________3. 根据图片及首字母提示，补全单词。

［1］—What does your uncle do? —He is a f__________.［2］—What would you like? —I''d like a bowl of n__________.［3］—What can Jane do? —She can r__________.［4］—Where is the girl? —She is b__________ the bag.［5］—How''s the weather? —It''s s__________.4. 按要求写单词。

1. eat （过去式） ___________2. candy （复数形式）___________3. take （过去式）___________4. man （复数形式）___________5. mouse （复数形式）___________6. buy （过去式） ___________7. wear （过去式）___________8. did not（缩写形式）__________9. fell （动词原形）___________ 10. print （名词）___________ 5. 写数字。

机械设计与制造172Machinery Design&Manufacture第5期2021年5月风切变效应对风力机叶片结构性能的影响分析杨瑞，全佩,张康康(兰州理工大学能源与动力工程学院，甘肃兰州730050)摘要:利用ANSYS软件的复合材料模块建立某5WM水平轴风力机叶片的铺层模型，通过静力分析和模态分析研究了风切变效应对叶片结构特性的影响。

采用Fluent软件对风力机叶片在有无风切变來流的情况下进行数值模拟，将数值模拟所获得的载荷加载到叶片铺层结构上,研究风切变效应对风力机叶片结构特性是否产生影响。

结果显示：风切变效应使來流风速的均值减小，从而导致所获载荷降低，使叶片的最大应力和最大位移减小；当有预应力干扰时，叶片的模态频率和叶尖变形量都明显提高，这会对叶片的结构特性产生影响。

关键词:风切变;风力机;静力分析;模态分析中图分类号:TH16；TK83文献标识码:A文章编号：1001-3997(2021)05-0172-04Analysis of Influence of Wind Shear Effect on StructuralPerformance of Wind Turbine BladesYANG Rui,QUAN Pei,ZHANG Kang-kang(College of Energy and Power Engineering,Lanzhou University ofTechnology,Gansu Lanzhou730050,China)Abstract：A5WM horizontal-axis wind turbine blade layup model is established by using ANSYS composite module.The influences of wind shear effect on blade structural characteristics are studied by static analysis and modal ing Fluent software,the three-dimensional numerical simulation of the wind turbine blade with or without wind shear effect is carried out to obtain the load distribution on the blade surface.The load is applied to the blade structure to study the influence of wind shear effect on the structural characteristics of the rotor blade at the rated wind speed.The results show that the wind shear effect reduces the mean ofthe incoming wind speed,r esulting in a decrease in the load and a decrease in the maximum stress and maximum displacement of the blade.When the prestressing force is applied,the modal frequency and tip deformation ofthe blade are obviously improved,which has an influence on the structural characteristics qfthe blade.Key Words: Wind Shear；Wind Turbine；Static Analysis；Modal Analysis1引言在大气层中,平均风速会随着高度的增加而增加,这种变化规律称为风切变。

Ch11、平均而言，在对流层中每上升100米，大气温度的变化是（）摄氏度。

A．下降0．6512； B．下降1.12； C．上升0．4～0．7122、在拔海200米处气温是6.12度，气温直减率等于标准大气气温递减率，那么结冰层的高度大约在（）。

A．平均海平面高度800米； B．平均海平面高度900米； C. 平均海平面高度1100米3、平流层对航空活动有利的方面是（）。

A：气流平稳、无恶劣天气、发动机推力增大B：气温低、飞机载重量增加、飞机真空速增大 C：气流平稳、能见度好、空气阻力小4．对流层大气热量的来源主要是（）。

A：空气吸收地面热辐射 B：空气吸收太阳辐射C：臭氧吸收太阳光中的紫外线5、中纬度地区的对流层，其平均厚度大约是( ).A．17—18千米； B．8～9千米； C. 12千米6、中高纬度地区上空的对流层顶，其高度随季节的变化是（）。

A．相对稳定； B．冬季较低； C．夏季较低7、对流层顶的高度随纬度的变化是（）。

A．随纬度的增大而降低； B．随纬度的增大而增高； C．在中纬度地区最高Ch21、两个高压与两个低压所夹区域称为（）气压区。

A. 鞍形B. 高压C. 低压D. 均压区2、（）是描述低压延伸出的狭长区域。

A. 槽B. 飓风或台风C. 雹线D. 鞍3、（）定为本站气压。

A. 高度表拨正值B. 在机场标高上的标准大气压力C. 本站气压订正到海平面上的气压值D. 在机场标高上的实际压力4、地面天气图上的等压线代表气压相同点的连线，其含义是（）。

A. 地面上气压值相同点的连线B. 将各测站实际大气气压订正到海平面上后，海平面气压值相同点的连线C. 本站高度上气压值相同点的连线D. 本站高度上标准大气气压值相同点的连线5．在标准大气中，海平面上的气温和气压值是（）。

A. 15℃、1000hPaB. 0℃、760mmHgC. 15℃、1013．25hPa6．地面天气图上填写的气压是（）。