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问题 单项选择题

我国标准规定加速器治疗床的等中心旋转的检定周期（）

A.每日

B.每周

C.每月

D.每半年

E.每年

答案

参考答案：C

解析：我国标准规定加速器治疗床的等中心旋转的检定周期为每月。

阅读理解

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Problems:                                     

小题1:Some people always smoke in public places.

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小题5:My parents hope I stay at home and study all day, even at weekends.   

Solutions:

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D．We could say politely "Excuse me, could you please put out your cigarette?"E. Call the bus company and ask for the better service.

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单项选择题

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