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问题 多选题

卤代烃能发生下列反应：2CH3CH2Br+2Na→CH3CH2CH2CH3+2NaBr。下列有机物中，可合成环丙烷的是 [ ]

A. CH3CH2CH2Br

B. CH3CH2CHBr2

C. CH2BrCH2CH2Br

D. CH3CHBrCH2CH2Br

答案

答案：C

补全对话，情景问答
从方框中选择恰当的句子完成对话。
A: What do you do ?
B; Is Zhang Ming here ?
C: Let's go .
D: Where is he ?
E: Let's go and play basketball .
F: What are you doing,now ?
A: Hi, Wang Tao ! Come here __1___.
B: Sorry ,I can't .
A: ___2____
B: I'm doing my homework ,
Go and ask Zhang Ming.
A: Thank you, _____3___
B: He is at home .
A: __4_____
C: Yes,come in,please. Hi,Li Bing.
A: Zhang Ming,do you want to play basketball with us?
C: Certainly ! ___5___ .
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单项选择题

电气设备检修时，工作票的有效期限以（）为限。

A.当天 

B.批准的检修期限 

C.工作完成期限 

D.自行决定
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