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半数有效量(ED50):是能引起()(质反应)或半数最大效应(量反应)的浓度或剂量,用半数有效浓度(EC50)表示。
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吸入麻醉药的AD95或ED99基本上均为()
A . 0.6MAC
B . 1.2MAC
C . 1.3MAC
D . 1.4MAC
E . 1.8MAC
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CSI200ED升级程序或下载逻辑时,串口设置应为()
A . MBPC
B . 2400
C . DIO
D . 无校验
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运输需求弹性较大,即运输需求弹性系数Ed大于1,它意味着运价的一定幅度上升或下降,都会引起运输需求()。
A . 以较小的幅度下降或上升
B . 以更大的幅度下降或上升
C . 以更大的幅度上升或下降
D . 以较小的幅度上升或下降
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EDS PLC的输入模块()的作用是现场预报警信号,现场设备运转状态信号或阀位开关信号
A . A、1746-IB16
B . B、1785-BCM
C . C、1746-OV16
D . D、1771-P4R
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吸入麻醉药的AD95或ED基本上均为()
A . A.0.6MAC
B . B.1.2MAC
C . C.1.3MAC
D . D.1.4MAC
E . E.1.8MAC
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He learnt how to do _________ when he was a journalist.
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In my first year at the university I learnt the _____ of journalism.
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逻辑电路如图所示,其逻辑功能是( )。A与非运算 B 或非运算 C 异或运算 D 同或运算9247b1de482945ed91198457b6a6bffc.png
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判断下图中的反馈类型(电压或电流、串联或并联、正或负反馈)。e77202d863d1723abf8ed1638105f773.jpg
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We ______ about 2,000 English words by the end of last term.A. have learnt B. learnt C. had learnt D. would have learnt
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American students learn business skills in school. Here is a story about some American students who learnt business skills by operating their own banks.
In December 1987,the Twiglet Bank was opened at an Elementary School in Miami,Florida. It is a real bank that accepts money for savings and makes loans, and it is operated by students between 10 and 12 years old. The bank is open for one hour two days a week.Students can put their money into the bank and withdraw it as they wish. Officials from a local bank helped the students start the bank. They trained twenty-three of ther to do all the different kinds of bank jobs, from counting money to guarding the bank. The students needed money to start the bank. They raised more than $ 2,000 by selling 50-dollar shares in the bank to parents, teachers, the local bank workers, and customers.
Organizing and operating the bank has taught the children a lot about the banking business. They have learned about raising and investigating money and how to use computers and other banking equipment. They have also learned how to ask for a job and to be responsible for their jobs.
1.Who operated Twiglet Bank?
A.The teenagers
B.The community
C.The government
2.Who helped these children start a bank?
A.Parents
B.Teachers
C.Bank officials
3.How did children raise money for their bank?
A.Their schools provided financial support for them
B.They found an organization to donate a set of fund
C.They sold shares in the bank to parents, teachers, etc
4. Which is NOT true for the benefits of children from operating their own bank?
A. They learned how to produce the money
B. They learned how to look for a job and do it well
C. They learned how to use computers and banking equipment
5. What is the best title for this passage?
A. A bank of Miami
B. A Student Bank
C. The Operation of American Bank
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In my first year at the university, I learnt the_____of journalism.
A.basics
B.basic
C.elementary
D.elements
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If English study is to Contribute to your future competence ______, it should be learnt systematically.
A.more than showing up I
B.rather than showing up
C.rather than to show up
D.more than to show up
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How man first learnt to invent words is unknown; in other words, the origin of language is a mystery. All we really know is that man, unlike animals, somehow invented certain sounds to express thoughts and feelings, actions and things, so that they could communicate with each other; and that later they agreed upon certain signs, called letters, which could be combined to stand for those sounds, and which could be written down. Those sounds, whether spoken or written in letters, we call words.
The power of words, then lies in their association with the things they bring up before our minds. Words became filled with meanings for us by experience; and the longer we live, the more certain words recall to us the glad and sad events of our past; and the more we read and learn, the more the number of words that mean something to us increase.
Great writers are those who not only have great thoughts but also express these thoughts in words that appeal powerfully to our minds and emotions. We should therefore learn to choose our words carefully and use them exactly, or they will make our speech silly and impolite.
The origin of language is ______.
A.clearly explained in this passage
B.a matter that can not be or has not been explained or understood
C.a question that was difficult to answer
D.a problem already solved
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We have well received your enquiry of October 18 and learnt your interest of our bedsheets and pillow-cases.()
A.well
B.enquiry
C.of
D.of
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This class we have learnt_______()
A.the origin of Thanksgiving Day
B.some Thanksgiving food
C.how to express thanks
D.all the above
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Have you ever noticed advertisements which say “Learn a foreign language in six weeks, or your money back! From the first day your pronunciation will be excellent.Just send...” and so on? Of course, it never happens quite like that.The only language that is easy to learn is the mother tongue.Think how much practice that gets! Before the Second World War people usually learnt a foreign language in order to read the literature of the country.Now speaking a foreign language is what most people want.Every year many millions of people start learning one.
Some people try at home, with books and records or tapes; some use radio or television programmes; others go to evening classes.If they use the language only twice or three times a week, learning it will take a long time.A few people try to learn a language fast by studying for six or more hours a day.It is clearly easier to learn the language in the country
where it is spoken.However, most people cannot afford this, and for many it is not necessary.They need the language in order to do their work better.For example, scientists and doctors chiefly need to be able to read books and reports in the foreign language.Whether the language is learnt quickly or slowly, it is hard work.Machines and good books will help, but they cannot do the student's work for him.
36.The advertisements say it would be easy to().
A.speak your native language better
B.keep in mind any foreign language
C.learn a foreign language within several weeks
D.learn by heart a foreign language
37.Nowadays most people want to learn()according to the text.
A.about the country where a language is spoken
B.to speak a foreign language
C.to read essays in the foreign language
D.to write in the foreign language
38.Before the World War people usually learnt a foreign language in order to()
A.communicate with their foreign friends
B.read the foreign newspaper
C.read the literacy works of the country
D.work in that foreign country
39.If you only use the language twice or three times a week,().
A.it is easy to learn it well
B.it will take a long time to learn the foreign language
C.you will never learn the language well
D.perhaps you will learn harsh language
40.No matter how quickly or slowly you want to learn a foreign language, you need to ().
A.read books
B.read reports
C.visit the country
D.work hard
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Fill in the blank with lexical chunks learnt from the teaching videos of unit 2. The idea of “being a good winner” is considered important in Chinese ethics, that is not rubbing one’s victory in or _____________(吹嘘)it.
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Teacher Tom gave the topic of “Send a Letter”, and then asked students to recall the words they learnt such as “post office, stamp, envelope, address, zip code”. Which memorizing strategy did he use?
A、Memory systems
B、Association
C、Dictionary strategy
D、Internet assistance
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hang(hung, hung或-ed, -ed)()
A.v.悬挂,吊着;把……吊起
B.n.头发
C.n.组,群
D.v.抓住;紧握
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dream (dreamt, dreamt 或-ed, -ed)()
A.上瘾, 成瘾, 入迷
B.n.& vt. 梦, 梦想
C.vt. (使人)快乐, 逗乐
D.n. 艾滋病