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问题 单项选择题

运行中的列车，遇前方情况不明时，可适当（），发现险情及时采取有效果断措施，并及时报告车站或调度所。

A.加速通过

B.减速或停车

C.鸣笛

D.呼叫前方

答案

参考答案：B

改错题

Great changes have been taken place in the way people communicate with each other. In the past people write letters to share informations and later they talked with each other in the telephone. Now more and more people use our own mobile phones to communicating. And instead writing on the paper, they e-mail to each other on the computer. As a result, people find that quicker and easier to communicate, and at the same time some people feel that they become poorer in writing. They worry about whether people can be as closely as before
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单项选择题

异氟烷的MAC是（）

A.1.5

B.1.15

C.2.5

D.2.15

E.8.2
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