Go for it! 新目标英语七年级上unit 8到unit12的课文

调整电位原理。

1、插上ATX电源后，有一个电压送到it8784ei，为it8784ei开机电路提供工作条件。

2、it8784ei里面的ATX开机电路将开始工作，会送一个电压给晶体，晶体起振工作，产生振荡，发出波形。同时ATX开机电路会送出一个开机电压到主板的开机针帽的一个脚，针帽的另一个脚接地。

3、当打开开机开关时，开机针帽的两个脚接通，而使it8784ei送出开机电压对地短路，拉低it8784ei送出的开机电压，而使it8784ei里的开机电路导通，拉低静态电压，使其变为0电位。使电源开始工作，从而达到开机目的。

在我上面的译文全部是机器翻译的。估计我是唯一的手工翻译的，而且是唯一可用的。

资讯通信发展国际有限公司（简称IDA国际）

E001 – 通用电气设备预调试项目检查清单

注：

1、SELV（独立的特低电压，电压限值不超过50V DC或无波纹120V DC），与地以及其它设备实行电气隔离，且隔离方式应保证在出现个别故障时不会导致电击事故的发生。

2、PELV（带保护的特低电压），与地之间没有电气隔离，但必须满足SELV的要求。

3、只适用于符合有关安全限流专用标准的设备。

4、不适用于C27

5、必须具有防止误接触带电部件的保护措施，但不包括恶意接触带电部件制造故障的情况。

6、必须保证只有专业人员或在专业人员直接监督下的指定人员才能够接近该设备。

7、设备防护等级

I级-设备的防触电保护不仅依靠基本绝缘措施，还采用固定布线的方式将暴露在外的导电部件与保护导体连接。

III级-设备的防触电保护依靠SELV电源提供。

8、必须提供接地导体，将设备的主接地端子与接地电极或其它接地装置相连接。

9、电路保护导体（CPC），将设备上暴露在外的导电部件与主接地端子相连。

9、非导电定位、非接地等电位连接、电气绝缘等保护措施，只能用于某些特殊的场合，而且必须由具有资质的电气工程师进行具体规定并置于有效的监督之下。

11、说明一切可能影响电气设备的设计及安全运行的外部因素。

12、必须具有功能转换装置，以便在设备正常运行时实现“开”、“关”、以及改变向设备的部分或整体的供电参数等功能。

13、所提供的保护措施（根据实际情况，应不低于IP2X 、IPXXB 或 IP4X）应通过试验进行验证。

14、在安装现场所采取的绝缘措施应经过试验，以保证其能够承受有关标准所规定的击穿电压或飞弧电压。

Unit 8

I’ll send you a photo of Lucky

Dear Miss Li,

I’d like to thank you for sending money to “Animal Helpers”, an organization set up to help disabled people For sure, you have helped make it possible for me to have “Lucky”, who has filled my life with pleasure Let me tell you my story

Being blind, deaf, unable to walk, or use your hands easily is something that most people cannot imagine But there are many people who face these challenges, and I am one of them Because I can’t use my arms or legs well, normal things like answering the telephone, opening and shutting doors, or carrying things have always been difficult for me Then one day last year, a friend of mine said that she would like to help me out She said she would talk to “Animal Helpers” to see if it would be possible for me to get a specially trained dog she also thought a dog might cheer me up I told her that I love animals, and that I’d love to have a dog

After six months of training with a dog at “Animal Helpers”, I was able to bring him home My dog’s name is “Lucky” – a good name for him because I feel very lucky to have him You see, I’m only able to have a :dog-helper” because of your kind donation!

How does Lucky help me, you might ask Well, he has been trained to understand different instructions For example, I say, “Lucky! Fetch my book,” and he does it at once He is very clever, and understands many English words, even some difficult ones like “upstairs”

Lucky is an amazing dog I’ll send you a photo of him if you like, and I could show you how he helps me too one day And so I thank you again for supporting “Animal Helpers” It is very important that this organization does not run out of money Your donation is greatly appreciated and the money is well used to help disabled people like me

Best wishes,

Liz Smith

Unit 9

Do you know when basket was invented

If you travel around China you will notice a very popular activity everywhere you go - basketball This much-loved and active sport is enjoyed by many, for fun and exercise

The sport of basketball is a little over a hundred years old It is played by more than 100 million people in over 200 countries including China, where basketball has been play in parks, schools, and even in factories

Basketball was invented by a Canadian doctor named James Naismith, who was born in 1861 When he was at college, his class was once asked to invent a new game that could be played indoors during the long winters Dr Naismith created a game to be played on a hard wooden floor, so the safety of the players was important Knocking into players and falling down would be dangerous

Dr Naismith divided the men in his class into two teams and taught them how to play his new game The aim of basketball is for players to get a ball into the "basket";a new hanging from a metal hoop Plays shoot from below the basket and may use the "backboard" for guiding the ball into the basket Players move towards one end of the court while throwing the ball to each other

It is believed that on December 21st, 1891, the first basketball game in history was played Then in 1936 in Berlin, it became an Olympic event A team from China took part, and although they didn't win they used the experience to help develop the game at home Since then, the popularity of basketball has risen worldwide, and the number of foreign players in America's NBA (National Basketball Association) has increased Basketball has also become a more popular sport for people to watch, and many young people dream of becoming famous basketball players

Unit11

Could you please lend me your pen

Asking for information or help is a very common and necessary activity, especially when we visit a foreign country So knowing how to ask for information politely is important In English, “Where are the restrooms” and “Could you please tell me where the restrooms are” are similar requests - both are correct English, but the first could sound rude It’s important to use correct language, but sometime this alone is not enough - we need to learn how to be polite when we make requests

In English, just like in Chinese, we change the way we speak when talking with different people The expressions you use might depend on whom you are speaking to or how well you know them If you say to your teacher, “Where is my book” your question will sound much more polite On the other hand, it might be alright to say “Where is my book” in some situations, perhaps with people you know well

And you would not usually say, “Peter, lend me your pen” A very direct order like this can sound rude in English Usually in English polite questions are longer and include extra language such as “Could you please…” or “Can I ask```” It sounds more polite to say, “Peter, Could you please lend me your pen” Sometimes we might even need to spend some time leading in to a question or request, for example, if you stop a stranger in the street, we might first say, “Excuse me, I wonder if you can help me” or “I’m sorry to trouble you but,” before asking them for help

It might seem that speaking politely is more difficult than being direct, and in a way this may be true However, in order not to offend people, learning about language etiquette is just as better at English, or any other language you wish to speak

Unit 12

You’re supposed to write quickly!

Can you write in English And can you also write e-mail English Maybe not E-mail English is a new kind of written English that is being used to save time

A lot of e-mail English words might look unfamiliar to us – many look like rubbish! This is because they come from a computer program called ICQ, which means I seek you ICQ is an e-mail “chatline” that people use to have online conversations with friends One Canadian teacher says, “People can use their computers to talk to each other But you are supposed to type quickly so the other person doesn’t get bored Using e-mail English helps you write quickly”

E-mail English mostly uses two types of words The first are “abbreviations” These are formed by using the first letter of each word in the phrase For example, BTW means “by the way”, and GSL means “can’t stop laughing” The second kind of word is a “homophone”- it’s created by combining letters and symbols, or numbers to sound like other words An example of this would be to write “great” as “gr8”, or to write “see you later” as“CUL8r”

When you write e-mail English you do not use punctuation marks only in the traditional way You are also supposed to use them to show the emotion you are feeling These are called “emoticons” The advantage of using punctuation marks is that you can make faces with them The most common one is the happy face - it looks like this :) and it is made with a colon and a right bracket beside it

E-mail English is fun - it’s almost like writing riddles You can learn it easily by yourselves, and experiment with your own ideas It is not rude to write e-mail English, but it is important to use it only at the proper time - when you are e-mailing a friend, or sending a message to a friend on mobile phone But you shouldn’t use it in class, and remember your teachers will not be pleased if you write e-mail English in a test!

中文的摩尔斯密码对照表见本文图。不同于现代化的数字通讯，摩尔斯电码只使用零和一两种状态的二进制代码，它的代码包括五种：短促的点信号“・”，读“滴”（Di）保持一定时间的长信号“—”，读“嗒”（Da）表示点和划之间的停顿、每个词之间中等的停顿，以及句子之间长的停顿。

1909年8月，美国轮船“阿拉普豪伊”号由于尾轴破裂，无法航行，就向邻近海岸和过往船只拍发了“SOS”信号。这是第一次使用这个信号。

1912年，著名的泰坦尼克号游轮首航遇险时，发送的是CQD（英国马可尼无线电公司决定用CQD作为船舶遇难信号），但因D（—··）易于其他字母混淆，周围船只并未意识到是求救信号，没有快速救援，在快沉没时才使用的新求救信号SOS（···———···）发报。泰坦尼克号沉没后，SOS才被广泛接受和使用。

扩展资料：

摩尔斯密码需要发送时可以由电报公司根据要发的信的长度收费。商业代码精心设计了五个字符组成一组的代码，作为一个单词发送。比如：BYOXO ("Are you trying to crawl out of it")；LIOUY ("Why do you not answer my question")；AYYLU ("Not clearly coded, repeat more clearly")。

这些五个字符的简语可以用摩尔斯电码单独发送。在网络用辞中，我们也会说一些最常用的摩尔斯商用代码。现在仍然在业余无线电中使用的有Q简语和Z简语：他们最初是为报务员之间交流通信质量、频率变更、电报编号等信息服务的。

1838年1月8日，Alfred Vail展示了一种使用点和划的电报码，这是摩尔斯电码前身。

作为一种信息编码标准，摩尔斯电码拥有其他编码方案无法超越的长久的生命。摩尔斯电码在海事通讯中被作为国际标准一直使用到1999年。1997年，当法国海军停止使用摩尔斯电码时，发送的最后一条消息是：“所有人注意，这是我们在永远沉寂之前最后的一声呐喊”！

参考资料来源：百度百科-摩尔斯密码

参考资料来源：百度百科-塞缪尔·莫尔斯

IT行业的发展前景非常错，具体表现为：

一、高薪的诱惑

IT行业涵盖的范围是很广的，包括了IT硬件设备、软件开发、IT的相关行业如：网络营销、电子商务、平面设计等。当前IT行业发展迅速，IT市场的潜力是无穷的，IT行业从业者的薪资待遇也就随之不断攀升了。比如通常拥有3-5年开发经验的工程师年薪在10万以上的不在少数。就电子商务而言，信息时代的网上交易、网站制作等都是需要大量人才的供给的，因此很多企业都愿意出高薪招揽电商人才。

二、技术的专业性

IT行业从业者是具备较强的专业性的，这也决定了IT从业人员的独特性，特别是像软件开发、网络营销等方向对于从业人员的要求都是比较高的，只有系统的学习了技能，扎实的掌握了知识点，且拥有了一定的项目实践经验，才能够很好的胜任企业的相关岗位，能够上岗就上手工作，类技术型人才是备受企业的青睐的。

三、工作具有挑战性

IT行业是一个需要不断自我挑战的行业，这就让很多人都想要进行尝试、挑战。IT行业的工作属于脑力劳动，需要不断的攻克难关，且在工作的过程需要不断的更新自己的技能知识，跟上时代的脚步。在该行业，从业者能够不断的突破自己，一步步的得到自我的提升。

四、充满成就感

IT行业重在战胜挑战，完成项目后不仅能获得额外的报酬，而且看到自己的成果推向市场得到认可后，会感到非常自豪，获得极大的成就感。而且就算不是自己所负责的项目，但是只要是自己有参与其中，在项目完成后也是会有极高的成就感的。

五、就业前景一片光明

IT行业不断的发展，因此专业的从业人员也是一直处于匮乏状态的，掌握了实用的IT技能就业前景是相当好的。可以从很多权威的数据看到，在具潜力的薪酬职业中，前二十位里面IT行业总是占有大比重的。而且从事IT行业的人，就算是跳槽再就业也是不会有什么难度的，与其他行业相比，IT行业只要有技术，其他的就都微不足道了。

六、学习机会多

IT行业就是需要不断学习的行业。该行业发展迅速，人才辈出，因此在此行业从业者能够随时随地的接触到新的资讯，了解到新的技术，不断的充实自己，跟上时代的发展。

当不定式（短语）、动名词（短语）或从句在某个句子中作宾语时，为保持句子结构平衡，避免句式结构的混乱，常用it作形式宾语，而将真正的宾语放在句尾。此时it仍只起先行引导作用，本身无词义。如下：

1、 当不定式（短语）、动名词（短语）或从句在复合宾语结构中作某些动词的宾语时（如think, make, find, consider, feel, suppose等）。

eg They found it pleasant that they worked with us Chinese

（他们发现与我们中国人一起工作很愉快。）

2、 某些表示“喜、怒、哀、乐”的动词，如like, enjoy, love, hate等，往往不能直接接宾语从句。

eg I don’t like it that he’s so lazy

（我不喜欢他那么懒惰。）

3、由及物动词与介词组成的固定搭配中，宾语从句若作该动词的宾语时，须借用it。

eg I leave it to your own judgment whether you should do it

（我让你自己判断这事是否该做。）

用it 作形式主语的结构

(1)It is ＋名词＋从句

It’s a pity that you missed the exciting football match多么可惜啊，你错过了一场精彩的足球比赛。

(2)it is ＋形容词＋从句

It is natural that… 很自然… It is strange that… 奇怪的是…

一、 It 用作形式主语

当不定式（短语）、动名词（短语）或从句在某个句子中作主语时,为保持句子结构前后平衡,避免头重脚轻,因此常用it作形式主语置于句首,而将真正的主语放在句尾此时it只起先行引导作用,本身无词义

eg It is wrong to tell a lie

(说谎是错误的) 〔It为to tell a lie的形式主语〕

It is no use arguing about it

(争吵是没用的) 〔It为arguing about it的形式主语〕

It is uncertain who will come

(谁要来还不确定) 〔It为who will come的形式主语〕

It 作形式主语的常见句型：

① It + be + 形容词 + to do sth / doing / that …

eg It is very important to learn a foreign language

(学一门外语非常重要)

It is useless crying over the spilt milk

(覆水难收)

It was really surprising that she married a man like that

(她嫁给那样的男士真让人惊讶)

② It + be +名词词组 + doing / that …

eg It is no good telling lies

(撒谎没好处)

It is a pity that you didn’t go to see the film yesterday

(你昨天没看成那部**真遗憾)

It is a truth that there would be no new China without the Communist Party

(没有***就没有新中国,这是毋庸质疑的)

③ It + be + 过去分词 + that …

该句型常见动词有：say, hope, think, suppose, expect, report, know, believe, decide, etc

eg It is said that they have invented a new type of computer

(据说他们发明了一种新型电脑)

It is believed that China will become one of the strongest countries in the world

(大家都相信中国将会步入世界强国之列)

It was reported that more than 170 thousand people died in the 2004 tsunami

(据报道,至少有十七万人在2004年那场海啸中丧生)

④ It + seems / appears / happens等不及物动词 + that …

eg It seems that he enjoys pop songs very much

(似乎他非常喜欢流行歌曲)

It appears that Tom might change his mind

(看来汤姆可能会改变主意)

⑤ 若句子是疑问形式,就只能用it作形式主语

eg Does it matter much that they won’t come tomorrow

(他们明天不来很重要吗)

Is it true that he will go abroad next week

(他下周出国是真的吗)

⑥ It + takes + (sb) + some time + to do sth

这是一个表示“（某人）花多少时间干某事”的句型,其中it是形式主语,代替后面的不定式（to do sth）,句型中的sb也可以省略

eg It took me some time to read the reading materials

(我花了一些时间才读完那段阅读材料)

It took him fourteen hours to go to New Zealand from Shanghai by plane

(从上海乘飞机去新西兰花了他14小时)

How long does it take you to go to Beijing from Qingdao by train

(从青岛坐火车到北京一般要花多久时间)

I am not sure, but I think it takes at least nine hours to get there

(我不能肯定,但估计至少要九个钟头才能到那儿)

二、It 用作形式宾语

当不定式（短语）、动名词（短语）或从句在某个句子中作宾语时,为保持句子结构平衡,避免句式结构的混乱,常用it作形式宾语,而将真正的宾语放在句尾此时it仍只起先行引导作用,本身无词义

下列四种情况须用it 作形式宾语：

① 当不定式（短语）、动名词（短语）或从句在复合宾语结构中作某些动词的宾语时（如think, make, find, consider, feel, suppose等）；

eg They found it pleasant that they worked with us Chinese

（他们发现与我们中国人一起工作很愉快）

I don’t feel it difficult to understand the Special English

（我觉得理解英语特别节目并不难）

He makes it a rule never to borrow money

（他立志决不向别人借钱）

I think it no need talking about it with them

（我认为没必要跟他们谈）

② 某些表示“喜、怒、哀、乐”的动词,如like, enjoy, love, hate等,往往不能直接接宾语从句；

eg I don’t like it that he’s so lazy

（我不喜欢他那么懒惰）

I hate it when my mother asks me to eat eggs

（我讨厌母亲要我吃鸡蛋）

③ that引导的宾语从句不能直接作介词的宾语；

eg You may depend on it that we shall always help you

（尽管放心,我们会随时帮你的）

Would you see to it that she gets home early

（你负责保证她早到家,好吗）

He insisted on it that he was innocent

（他坚持说自己是无辜的）

④ 由及物动词与介词组成的固定搭配中,宾语从句若作该动词的宾语时,须借用it

eg I leave it to your own judgement whether you should do it

（我让你自己判断这事是否该做）

We owe it to you that there wasn’t a serious accident

（多亏了你才没有发生严重事故）

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