电牵引采煤机的优点是（）、易于实现微机自动控制、机械传动和结_爱下问搜题

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问题多项选择题

电牵引采煤机的优点是（）、易于实现微机自动控制、机械传动和结构较简单、生产率显著提高等。

A、工作可靠性提高

B、牵引特性较好

C、机械传动效率高

D、机械传动较复杂

E、牵引力大、牵引速度高

答案

参考答案：A, B, C, E

选择题

某有机物的结构简式为，它在一定条件下可能发生的反应有：

①加成、②水解、③酯化、④氧化、⑤中和、⑥消去，其中可能的是

A．②③④

B．①③⑤⑥

C．①③④⑤

D．②③④⑤⑥

阅读理解

Ask Dr .Jeffers	This month Dr. Jeffers is answering questions about the human brain and how it works.
Dear Dr. Jeffers, One of my colleagues, Felix Moeller, told me that scientists are learning to use computer to 'read minds'. Is there any truth to this story? -Jane Leon, New York, USA Dear Ms. Leon, Well, a lot of research is being conducted in this area, but so far, the brain scanning equipment and corresponding computer programs haven't been able to actually read thoughts. In one experiment, test subjects(受试者)were connected to scanning equipment and shown two numbers on a screen. They were then asked to choose between adding or subtracting(减)the two numbers. Using this method, researchers were able to follow brain processes and make the correct assumptions(假设)70 percent of the time. It's not quite mind reading, but it's certainly a first step. -Dr. J.
Dear Dr. Jeffers, My three-year-old son loves it when I dig my fingers into his sides and tickle (胳肢)him until he laughs uncontrollably. The other day I noticed him trying to tickle himself but he couldn't do it. Why not? -Glenn Lewis, Vancouver, Canada Dear Mr. Lewis, It's because of how the brain works. The brain is trained to know what to pay attention to and what to ignore. It causes us to ignore physical feelings we expect to happen, but it causes a mild panic reaction when there is an unexpected feeling. For example, you don't notice how your shoulder feels while you're walking down the street. But if someone comes up behind you and touches you lightly on the shoulder, you may jump in fear. It's that unexpected part that causes the tickle reaction. -Dr. J.

1.What can we learn from the answer to the first question?

A. Some equipment is able to read human minds.
B. Test subjects have been used to make decisions.
C. Some progress has been made in mind reading.
D. Computer programs can copy brain processes.

2. People laugh when tickled by others because the feeling is _______.

A. uncomfortable
B. expected
C. comfortable
D. unexpected

3.Who has got a little child according to the text?

A. Mr. Lewis
B. Ms. Leon
C. Mr. Moeller
D. Dr. Jeffers

4. According to the text, Jeffers is probably _______.

A. a computer programmer
B. a human brain expert
C. a test subject
D. a medical doctor