NXP Cortex--M3 LPC1768
NXP Cortex
201092
zdeh726@https://www.doczj.com/doc/298786966.html,
zdeh726@https://www.doczj.com/doc/298786966.html,
ARM M3 STM32NXP LPC17XX LPC1768
STM32
ZLG3
LED
NXP ARM
ZLG
ARM M3STM32LPC17XX
LPC17XX NXP M3
STM32LPC17XX
stm32f103VET6100512KB flash64KB SRAM72MHz AD DAUSB FSMC LPC1768100512KB flash 64KB SRAM100MHzADDA32USB//OTG
PWMSTM32FSMC LPC1768
USB stm32F105stm32f107 USB
40stm32NXP
NXP
LPC1768
ARM7ARM cortex m3
LPC17XX
LPC1768
1.1
LPC1768NXP ARM Cortex-M3
LPC17XX LPC17XX Cortex-M3
LPC1700
100MHz LPC1769LPC1759120MHz ARM Cortex-M3 CPU3LPC17XX
512KB flash64KB
MACUSB//OTG8DMA
4UART2CAN2SSP SPI3 IIC22IIS812ADC10 DAC PWM46 PWM RTC70 IO
1.2
64KB SRAM
32KB CPU/
216KB SRAM
SRAM USBDMA
MAC RMII DMA
USB 2.0//OTG
PHY DMA
4UART FIFO DMA RS-485 1UART modem IO RS-485UART IrDA
CAN2
SPI
2SSP FIFO SPI SPI SSP GPDMA
3IIC
IIS
IIS GPDMA IIS3
4
4/810
PWM
PLLCPU
PLL USB
2.1
1
2,3
1,2
2
POWER_S
LPC17XX
A 3.3V VDD3V3
B 3.3V VDDREG3V3
C ADC DAC3.3V
D ADC VREFP
E RTC 3.3V VBAT
5V USB
Power_112USB 23
POWER_S C5C6C8
1117-3.3 3.3V LPC1768
AD
L1-L4
1117-3.3 3.3V
800mA RTC
GND
LPC17XX4RESET PORBOD
RC
RC
S1S1
2.4
GND
GND
LPC17XX 3RTC RC LPC17XX LPC17XX RC
A RC
RC IRC PLL CPUIRC USB IRC 4MHz LPC17XX IRC
B
PLL0CPU 1-24MHz PLLPLL0CPU
OSC_CLK,PLL0PLLCLKINARM
CCLK PLL PLLCLKIN CCLK
LPC17XX
XTAL1100pF
200mVXTAL2
C RTC
RTC32.768KHz RTC
RTC Hz RTC32KHz
PLL0CPU
Y1RTC32.768KHz Y2
12MHz
2.5 JTAG
ARM20JTAG JTAG LPC1768RTCK 4.7K
LPC1768JTAG
JTAG
2.6
Max3232 3.3V RS2322
LPC176802
S_COM1324
235460RS232 ISP0TTL
ISP ISP ISP
RTS DTR ISP
3RTS DTR
2.7
INT0&KEY
LPC17683INT0210K 2.8 LED
LED
POW ER_LED
LED
LPC17684LED LED LED 2.9 EEPROM
GND
LPC1768400K IIC
24C02
24C02
4.7K
2.10 USB
2,3
USB USB bootloader LPC1768
USB USB
USB USB D+D-
D+USB
D-USB LPC1768 USB D+1.5K
S_USB 23Q3USB USB USB12
P2.9USB
USB
211 LPC1768
LPC1768VDD VSS
0.1uF
3.1
LPC1768keil MDK IAR
4.12keil keil ARM keil 5151
keil,IAR
C++keil keil
keil LPC1768
Keil
Google keil keil C:\keil
keil
keil
A Project New uVision Project:
B
C NXP LPC1768OK ""
D
E File New
F.c
G Target1 Source Group1
Add File to Group...
F C
Add Add Add Close
hex output Create HEX File OK
HEX
jlink keil Debug
Use Cortex-M3 J-LINK Seting seting debug Prot SWMAX Clock3M flash download ADD OK Utilities
全新版大学英语综合教程4（第二版）习题答案 Unit 1 Vocabulary I. 1. 1) alliance 2) at the cost of 3) stroke 4) limp 5) minus 6) regions 7) declarations 8) siege 9) raw 10) bide his time 11) have taken their toll 12) in the case of 2. 1) is faced with 2) get bogged down 3) is pressing on / pressed on 4) drag on 5) get by 6) dine out 7) have cut back 8) get through 3. 1) lead to the conquest of cancer in the near future 2) has been brought to a halt by the delayed arrival of raw materials due to the dock workers’ strike 3) will/should never get in the way of her career 4) caught the foreign minister off guard 5) of the electronic calculator has rendered the slide rule out of date/obsolete 4. 1) Being faced with … the occupation of … regions 2) crucial to … efficient … to reckon with … weaken … be brought to a halt 3) a heroic …the decisive …turned the tide …siege …by launching II. More Synonyms in Context 1) During the First World War, battles occurred here and there over vast areas. Some of the most dramatic fighting took place in the gloomy trenches of France and Belgium. 2) Elizabeth made careful preparations for the interview and her efforts / homework paid off. 3) I spent hours trying to talk him into accepting the settlement, but he turned a deaf ear to all my words. 4) Pneumonia had severely weakened her body, and I wondered how her fragile body could withstand the harsh weather. III. Usage 1) fall ill 2) lay dead at home for two weeks 3) dropped dead from a heart attack 4) fell asleep.
Unit1 Ways of Learning Vocabulary I 1. 1)insert 2)on occasion 3)investigate 4)In retrospect 5)initial 6)phenomena 7)attached 8)make up for 9)is awaiting 10)not; in the least 11)promote 12)emerged 2. 1) a striking contrast between the standards of living in the north of the country and the south. 2)is said to be superior to synthetic fiber. 3)as a financial center has evolved slowly. 4)is not relevant to whether he is a good lawyer. 5)by a little-known sixteen-century Italian poet have found their way into some English magazines. 3. 1)be picked up; can’t accomplish; am exaggerating 2)somewhat; the performance; have neglected; they apply to 3)assist; On the other hand; are valid; a superior II 1. 1)continual 2)continuous 3)continual 4)continuous 2. 1)principal 2)principal 3)principle 4)principles 5)principal III 1.themselves 2.himself/herself 3.herself/by herself/on her own 4.itself 5.ourselves 6.yourself/by yourself/on your own Comprehensive Exercises I.cloze 1.
ChemDraw软件 Chemdraw7.0是Cambridgesoft公司出品的Chemoffice系列的最新版本Chemoffice2002的重要组成部分。 一、ChemDraw软件简介 1、启动：在Windows下，有两种打开方式：在桌面上，双击ChemDraw图标； 或者在“开始菜单”里选择ChemDraw选项。 2、界面简介：下图为ChemDraw的图形化用户界面（GUI）。 关于画图的主要工具——工具栏，其主要功能如下图所示：
ChemDraw为绘制化学结构，提供了以下工具。 化学键工具, 环工具, 脂肪链工具, 自动错误矫正, 在ChemDraw Ultra中还新增了从化学名称到结构的功能。 ⑴、化学键的绘制： 绘制化学键有以下几种工具，利用这些工具，可以直接在文档中单击或者拖拉来绘制化学键。默认的键长和键角用Object菜单中Fixed Lengths和Fixed Angles选项固定。
⑵、环的绘制： 环的绘制，可以使用右边的工具： 环的绘制可以用以下的方法，注意以下的细节：如果选择环工具之后，在一个原子上单击，则会在该原子上添加一个环，如果在一条键上单击，则会在键上添加环，具体的演示如下： 如果想要绘制共轭环结构，可以按下CTRL键的同时，在文档中单击放置环。这样，会在环中出现一个圆圈。当然，这种情况下，环已烷的椅式结构除外。 ⑶、脂肪链键的绘制： 选择脂肪链工具，在文档上拖动鼠标即可画出长链。也可以在文档空白区域或者一个原子上单击，在出现的对话框输入想要链长的原子数。
⑷、键的编辑： 改变键的类型：选择键工具，指向已经存在的键，单击，则会出现新的类型的键。 改变楔形键和虚格键的方向：选择楔形键和虚格键工具，点击适当的位置，则方向被自动调整。 ⑸、移动原子：选择键的工具，指向一个原子，然后按下Shift键的同时，拖动这个原子，就可以改变键的方向。 ⑹、自动绘制结构从化合物的名字： 从ChemDraw Ultra 的Structure菜单中选择Convert Name to Structure命令，在出现的对话框中输入2-bromobenzoic acid，点击OK后，就可以在文档中看见结构了。也可以先用文本工具在文档中输入一些化合物的名字，然后选择这个名字，在选择Structure菜单Convert Name to Structure即可得到结构。
Unit Two Man and Technology Enhance Your Language Awareness Words in Action ■ Working with Words and Expressions 1. In the box below are some of the words you have learned in this unit. Complete the following sentences with them. Change the form where necessary. ■ Answers: productivity phenomenon isolation gradual opponent advent genetic universal extreme ))))))))) 123456789 10) nasty 11) boom 12) formal 13) survey 14) Similarly 15) modify 16) rough 2. In the box below are some of the expressions you have learned in this unit. Do you understand their meanings? Do you know how to use them in the proper context? Now check for yourself by doing the blank-filling exercise. Change the form where necessary. ■ Answers: at the same time are stuck with for certain make no difference on average when it comes to are better off built into come to mind ))))))))) 123456789 10) close to 11) in favor of ■ Increasing Your Word Power 1. You will read six pairs of words which are similar in meaning but are different in usage. Reflect on the
大学英语综合教程2课后答案 Unit 1 Text A Vocabulary I. 1.1) insert 2) on occasion 3) investigate 4) In retrospect 5) initial 6) phenomena 7) attached 8) make up for 9) is awaiting 10) not?in the least 11) promote 12) emerged 2. 1) There is a striking contrast between the standards of living in the north of the country and the south. 2) Natural fiber is said to be superior to synthetic fiber. 3) The city’ s importance as a financial center has evolved slowly. 4) His nationality is not relevant to whether he is a good lawyer. 5) The poems by a little-known sixteenth-century Italian poet have found their way into some English magazines. 3. 1) be picked up, can’ t accomplish, am exaggerating 2) somewhat, performance, have neglected, they apply to 3) assist, On the other hand, are valid, a superior II.
全新版大学英语综合教程4【第二版】习题答案 主编：荫华 外语教育 Unit 1 Part II Text A lexf Organization Parts Paragraphs Main Ideas Part One Paras 1-2 Introduction — Both Napoleon's and Hitler's military campaigns failed because of the severity of the Russian winter. Part Two Paras 3-11 Napoleon's military campaign against Russia Part Three Paras 12-20 Hitler's military campaign against the Soviet Union Part Four Para 21 Conclusion—the elements of nature must be rekoned with in any military campaign. 2. Sections Paragraphs Main Ideas Section One Paras 12-13 Hitler's blitzkrieg against Russia and Stalin's scorched earth policy Section Two Paras 14-18 the battles fought at Leningrad, Moscow and Stalingrad Section Three Paras 19-20 the Russian counter-offensive and the outcome of the war Vocabulary I. 1. 1) alliance 2) at the cost of 3) stroke 4) limp 5) minus 6) regions 7) declarations 8) siege 9) raw 10) bide his time 11) have taken their toll 12) in the case of 2. 1) is faced with 2) get bogged down 3) is pressing on / pressed on 4) drag on 5) get by 6) dine out 7) have cut back 8) get through 3. 1) The rapid advance in gene therapy may lead to the conquest of cancer in the near future. 2)Production in many factories has been brought to a halt by the delayed arrival of raw materials due to the dock workers’ strike 3)Sara has made up her mind that her leisure interests will/should never get in the way of her career. 4) Obviously the reporter's question caught the foreign minister off guard. 5)The introduction of the electronic calculator has rendered the slide rule out of date /obso lete.
全新版大学英语(第二版)综合教程2课后答案及翻译 9大学英语练习册2 9单元1 ★课文a 词汇I. 1.1)插入2)在场合3)调查4)回顾5)最初的现象 7)附上8)弥补9)正在等待10)不…至少11)促进1 2)出现 2。这个国家的北部和南部的生活水平有着鲜明的对比。据说天然纤维优于合成纤维。这座城市作为金融中心的重要性发展缓慢。4)他的国籍与他是否是一名好律师无关。一位鲜为人知的16世纪意大利诗人的诗被一些英文杂志转载。 3。1)捡起来，不能完成，有点夸张 2)表现，忽略了，他们申请3)协助，另一方面，是有效的，一个上级2。 1。1)连续2)连续3)连续4)连续 2。1)原则2)原则3)原则4)原则5)原则3。 1。他们自己2。他/她自己3。她自己/独自/独自一人。本身5。我们自己。你自己/你自己/你自己的综合练习一。完形填空 1。1)对比2)夸大3)优先级4)另一方面5)提升 6)拾起7)协助8)完成9)偶尔10)忽略 11)值得的12)优越的 2。1)结束2)执行3)面对4)胜任5)装备
6)设计7)方法8)休息9)绝对10)质量 2。翻译 1。1)背离传统需要巨大的勇气。汤姆过去很害羞，但这次他足够大胆，在一大群观众面前表演了一场。 3)许多教育者认为在孩子很小的时候培养他们的创新精神是可取的。假设这幅画真的是一幅杰作，你认为它值得买吗？ 5)如果数据在统计上是有效的，它将揭示我们正在调查的问题。2。为了提高我们的英语，多读、多写、多听、多说是至关重要的。此外，背诵尽可能多的好文章也很重要。如果你头脑中没有大量优秀的英语写作，你就不能用英语自由地表达自己。在学习过程中总结我们的经验也是有帮助的，因为这样做，我们可以找出哪种学习方式更有效，会产生最理想的结果。只要我们继续努力，我们将在适当的时候完成掌握英语的任务。★文本B 理解检查:c c d a c b语言练习1。g h e c f a b d 2。1)采用2)账户3)从你的角度来看4)最终5)此外6)基金7)年度跟踪9)步调10)打算11)观点12)设计 单元2 ★文本A词汇表 1。1.1)突如其来的情感3)祝福4)磨损5)日期 6)后果7)似乎8)与9)好奇10)真正的11)主要是12)情感 2)相反。1)当你面临不止一个问题时，先试着解决最简单的一个。水对于所有生命形式的存在都是至关重要的。
Chemdraw的使用及技巧 1.3 Undo和Redo命令 如同Word等软件一样，ChemDraw具有保持前一步所做工作的功能。点击右键，弹出菜单中的前两项就是Undo和Redo命令。也可以通过点击图标和来进行操作。就个人经验而来，此操作的次数相当可观，可以使人很放心的进行操作，不需过多担心失误。 下面是对结构工具栏主要部分的使用的描述。 1.4默认设置的变化 1）Preference命令 在ChemDraw7.0的版本里，Preference位于File菜单的下拉选项中Units（单位）可以改变标尺，交叉校准线等单位，但一般不需要改动。选择单位有cm,in(1in=2.54cm)等。Tolerance（容差）允许改变的光标快的大小尺寸。Tolerance影响光标去选择和接触对象的远近和难易程度。Include Footer(打印页脚)包括文件名，最后制作的日期和时间，显示在打印文件的左下角。 Show 35mm Slide Boundary Guides (35mm幻灯片界限设置) Automatic Atom Labels（自动标记原子）建议选择此项功能，可以自动添加氢原子，标记其它元素，相当于快捷键。 Print Background Colour（打印背景颜色）去掉为白色。 Check Structure When Copying to Clipboard or Exporting（拷贝到粘贴板上时的结构检查）Show Attachment Rank Indicators（显示接触顺序指示）用于显示顺序接触点的虚拟解释。Always Display and Print Reacting Mapping（显示和打印反应过程） Auomatic Reaction Mapping（自动反应图）建议选择 2）Document settings命令 Drawing Settings设置如何绘制键的文件设置，因为化学科技论文有固定的格式，一般不需要改变设置，需要说明的仅有Fixed length选项，有时候因为处理对象不同，需要取消对键长的固定。如果做ppt演示，最好把line width放宽一点（画分子的时候也许Tolerances也要大点，并且所有的键、原子都可以选成不同的颜色，这样贴到powerpoint里面比较pp一些。Color Palette（调色板）可以添加，移动或变化默认的前景或背景的颜色。 1.5 ChemDraw文件操作 ChemDraw文件本身的格式是*.cdx。在File /Apply Document Settings from…中集成了国际很多通用的格式，经常用的会是ACM格式。 下面是ACS（美国化学会）所有杂志包括JACS对ChemDraw画分子结构的要求： 1) As drawing settings select: chain angle 120°bond spacing 18% of width，fixed length 14.4pt(0.508cm,0.2in.)，bold width 2.0pt(0.071,0.0278in.)，line width 0.6pt(0.021cm,0.0084in.)，margin width ， 1.6pt(0.056cm,0.0222in.)，hash spacing 2.5pt(0.088cm,0.0347in.)，2) As text sttings select:，Font Helvetica，Size10pt，3) Under the preferences choose:，UnitsPoints，Tolerances 3Pixels，4) Set the page setup to 100%，5) Label the drawings:，"Reduce to 75% of current size for publication." 每次打开一个文件就会出现一个新的文件窗口，如果打开多个文件，文件窗口只显示最后打开的文件，通过Ctrl+Tab 可以进行窗口的变换。 第二节化学结构的绘制2.1键工具1.固定键的长度，角度 软件对键的长度有一定的限制，在Object下拉菜单中，点击Fixed lengths，则画出的键长度固定。同样的方法Fixed angles用于固定键的角度，默认值15度为一个单位。如果需要临时改变键的长度或者角度，按下Alt键，同时按动键到所需长度和角度即可。 2. 楔键工具，点击楔键工具，从楔键窄面点按动到宽面另一点。绘制完成后，将鼠标放在键上，单击即可改变键的方向。 3.多重键的绘制，在Chemoffice2002以后的版本中直接包含了绘制各种多重键的工具，直接点击即可。也可以用比较原始的方法。列在下面，尽管原始，但又是比较省事，免去切换功能键，1双键选择实键工具，点击绘制单键，在单键基础上再按动一次即可得到双键。通过在双键中间（出现光标块）的点击可以改变双键的位置，在上，在下或中间。2)双抉择键在双键基础上，选择波浪键，在双键上点击即可。3) 叁键双键基础上，再次按动。叁键再次点击后即成单键。注意，以上按动和点击的区别，按动是按住鼠标，拉出一根键后松开，
1.Only those who have lived through a similar experience can fully appreciate this. 只有那些有过类似经历的人，才能够完全理解这一点。 2. Scientists have been hard pressed to figure out how these particles form and interact . 科学家一直没弄明白这些粒子是怎么形成的、又是如何相互作用的。 3. I’d like to express my special thanks to everyone who has contributed over the years in one way or another. 我要特别感谢每一个在这些年来以不同方式作出贡献了的人。 4. The individual success of the employees in a team environment results in success for the company. 团队环境中员工个人的成功能带来公司的成功。 5. The war, although successful in military terms, left the economy almost in ruins. 这场战争，虽说从军事角度而言是成功的，却另经济几乎崩溃。 6. He decided to channel his energies into something useful, instead of being glued to the TV set all day. / instead of sitting in front of the TV set all day long. 他决定把自己的精力用在有益的事上，而不是整天守在电视机前。 7. There is a difference between strength and courage. It takes strength to survive. It takes courage to live. 力量与勇气是有区别的。生存需要力量，生活需要勇气。 8. She was by nature a very affectionate person, always ready to give a helping hand to others. 她天生是个温柔亲切的人，总是乐于向别人伸出援手。 Unite 6 1.It is only by trail and error that we learn and progress / make progress. 只有通过反复实践我们才能学习和进步。 2.You should know that the education of the heart is very important. It will distinguish you from others. 你应该知道心灵的教育是很重要的。它会使你与众不同。 3. A person who strives for perfection tends to have a low threshold of pain. Things around bother them. 一个追求完美的人对痛苦的容忍度往往很低。周围的事物都会让他们看不顺眼。 4.They regard honesty as a matter of principle and they are willing to sacrifice everything for its sake. 他们认为正直是个原则问题，愿意为之牺牲一切。 6.People judge you by the company you keep. You are inviting trouble if you get into bad company. 人们根据你交往的朋友来判断你。如果与坏人为伍，你就是自找麻烦。 6) Speaking your mind without regard to other people’s feelings is not a virtue. 直言不讳、不顾其他人的感受不是一种美德。 7) Her sensitivity exposes her to more suffering and pain than ordinary people can imagine. 她的敏感另她承受的痛苦比普通人所能想象的要多。 8) We must awaken people to the need to protect our environment. 我们必须使人们意识到保护坏境的必要性。
ChemDraw教程：认识图形工具图标板 ChemDraw图标学名为图形工具图标板，或称图形工具板，含有所有能够在文件窗口绘制结构图形的工具，选择了这些工具的图标后，光标将随之改变成相应的工具形状。工具板见下图 ChemDraw中的图形工具图标板 选择工具时，一次只能选一个。在图标右下角有小黑三角的工具图标里，含有进一步的子工具图标板。用鼠标按下含三角的图标时，子工具图标板将显示出来。 【选择】工具：包括（1）蓬罩工具，用于选择目标。拖拽蓬罩工具，以方形框罩住目标（具有区域性），然后进行编辑。（2）套索工具，用于选择目标。拖拽套索工具套住目标（具有随意性），然后进行编辑。
【键】工具：包括实键、虚键、切割键、切割楔键、黑体键、黑体楔键、空心楔键、配键、波浪键。用于绘制单键、双键和三键。 【环】工具：包括环丙烷环、环丁烷环、环戊烷环、环己烷环，环庚烷环、环辛烷环、环己烷凳环、环戊二烯和环苯环。用于快速绘制常用的环结构组成。 【交替基团】工具：在ChemDraw Pro中，此工具用来建立交换基团（R、G等），它们代表一组物质。 【无环链】工具：用于快速绘制任意长度链。 【橡皮】工具：用于绘制擦去无用的线条、画面等。 【文本】工具：用于建立原子符号和说明。 【笔】工具：用于绘制随意类型的图，例如：常规箭和轨道等。 【箭头】工具：用于绘制各类箭头。含有箭头工具箱。 【轨道】工具：用于绘制轨道。单击图标图标右下角箭头，出现轨道工具箱。 【基元】工具：用于绘制反应过程中常见符号。含有基元工具箱。 【符号】工具：用于绘制重要化学符号。含有符号子工具箱。 【弧形】工具：用于绘制各类弧，含有弧形子工具箱（见下图）。 【接触点】工具：用于设置交替基团的接触点。 【原子反应】工具：用于建立原子间在不同结构中的联系。 【模板】工具：用于绘制模板库存储的图形。含有模板图形目图形目类类17项，如选Amino Acids，可得氨基酸模板工具。 通过学习ChemDraw图形工具图标板的入门课程，相信大家一定对图形工具板上的每个图标有了一定的认识，在以后绘制化学图形时不再陌生。想要获取更多ChemDraw使用教程可访问ChemDraw中文官网。
Unit Two Man and Technology Enhance Your Language Awareness Words in Action ▆ Working with Words and Expressions 1.In the box below are some of the words you have learned in this unit. Complete the following sentences with them. Change the form where necessary. ▆ Answers: 1)productivity 2)phenomenon 3)isolation 4)gradual 5)opponent 6)advent 7)genetic 8)universal 9)extreme 10)nasty 11)boom 12)formal 13)survey 14)Similarly 15)modify 16)rough
2. In the box below are some of the expressions you have learned in this unit. Do you understand their meanings Do you know how to use them in the proper context Now check for yourself by doing the blank-filling exercise. Change the form where necessary. ▆ Answers: 1)at the same time 2)are stuck with 3)for certain 4)make no difference 5)on average 6)when it comes to 7)are better off 8)built into 9)come to mind 10) close to 11)in favor of ▆ Increasing Your Word Power 1.You will read six pairs of words which are similar in meaning but are different in usage. Reflect on the differences in usage between the words in each group and fill in each blank with a proper one. Change the form if necessary. ▆ Answers: 1)exterior 2)external 3)delightful 4)pleasant 5)separate
全新版大学英语综合教程（第二版）2 TextA参考答案 Unit 1 Text A After listening 1. much more advanced 2. apply some academic pressure, gave in to his pleas/gave up 3. a duck takes to water 4. memorizing (stuff), thinking 5. ample space to grow Text Organization 1-1 The text begins with an anecdote. 1-2 His thoughts are mainly about different approaches to learning in China and the West. 1-3 He winds up the text with a suggestion in the form of a question. 2. 1, show a child how to do something, or teach by holding the hand; teach children that they should rely on themselves for solutions to problems. 2,give greater priority to developing skills at an early age,believing that creativiy can be promoted over time. Put more emphasis on fostering creativity in young children, thinking skills can be picked up later. Language Sense Enhancement (1) summarizing (2) value originality and independence (3) contrast between (4) in terms of (5)harbor (6)fearful (7) comparable (8) promote creativity (9)emerge (10) picked up
C h e m D r a w教程如何绘 制反应方程式 Document serial number【LGGKGB-LGG98YT-LGGT8CB-LGUT-
ChemDraw教程：如何绘制反应方程式 是国内外最流行、最受欢迎的化学绘图软件，它可以建立和编辑与化学有关的一切图形。在本实例指导中，将学习如何使用ChemDraw绘制反应方程式。 绘制前的操作准备 在本实例中，将学习如何绘制反应方程式（见下图），绘制实例前先进行以下操作： 实例指导 （反应方程） （1）开始启动chemdraw。 （2）从File菜单，选择Save As命令。 （3）在文本对话框的底部输入。 （4）在指南中存储文件。 （5）单击OK按钮。 （6）打开Object菜单，确认在Fixed lengths和Fixed angles命令的左边有对号，如果没有对号，再选择一遍。 1、绘制第一个键 （1）在工具板上选择实键工具，见下图左。
（2）把鼠标(当选中单键工具时，鼠标在屏幕上显示为十字形)放在文件窗口的任意合适的位置(定位)，同时单击鼠标，见下图中。 （3）向右上角拖动鼠标，见下图右。 （4）当放开鼠标时，键与X轴成30度角，伸展的键长为固定键长。见文件窗口左下角的【信息区域】框。 【注意】当利用键工具绘制化学结构时，总是要建立结构的第一个键，如下图所示。不能用键工具单击出结构来，如果用环工具，可用单击开始第一个结构。 ？ 绘制第一个键 2、加一个键 （1）用鼠标指向键右面的原子(放在点位)，见下图左。 （2）单击原子加一个键，见下图右。形成的键与第一个键成120度角。 ？ 加一个键 3、加第二个键
To improve our English, it is critical to do more reading, writing, listening and speaking. Besides, learning by heart as many well-written essays as possible is also very important. Without an enormous store of good English writing in your head you cannot express yourself freely in English. It is also helpful to summarize our experience as we go along, for in so doing, we can figure out which way of learning is more effective and will produce the most desirable result. As long as we keep working hard on it, we will in due course accomplish the task of mastering English. Unit 2 With more and more donations coming in, our university will be much better off financially next year. We will thus be able to focus on the most important task that we, educators, must take on: to encourage students to attain their scholarly/academic goals, to train them to be dependable and responsible individuals, to prepare them for the life ahead, and to guide them in their pursuit of spiritual as well as material satisfaction. Unit 3 George, the son of Mr. Johnson, liked listening to heavy metal music in the evenings, which made it hard for other residents in the community to fall asleep. Eventually the exhausted neighbors lost their patience and decided on direct interference. They called Mr. Johnson to tell him in a frank manner what they were thinking. Mr. Johnson assured them that he would certainly settle the issue. As soon as he put down the phone he scolded his son, “What has come over you? You should know better than to disturb others for your own amusement.”In the end George traded his CDs for computer games software from his classmates. Unit 4 Perhaps you envy me for being able to work from home on the computer. I agree that the Internet has made my job a lot easier. I can write, submit and edit articles via email, chat with my colleagues on line and discuss work with my boss. With a click of the mouse, I can get all the data I need and keep up with the latest news. But then, communicating through the Net can be frustrating at times. The system may crash. Worse still, without the emotional cues of face-to-face communication, the typed words sometimes seem difficult to interpret. Unit5 Numerous facts bear out the argument/statement/claim that in order to recover speedily from negative emotion, you should allow yourself to cry. Y ou needn't/ don't have to be ashamed of crying. Anxiety and sorrow can flow out of the body along with tears. Consider the case of /Take Donna. Her son unfortunately died in a car accident. The intensity of the blow made her unable to cry. She said, "It was not until two weeks later that I began to cry. And then I felt as if a big stone had been lifted from my shoulders. It was the tears that brought me back to earthand helped me survive the crisis."