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问题 单项选择题

CT机房安装空调，主要为了：（）

A.病人和工作人员舒服

B.不设窗户，使射线屏蔽更安全

C.设备贵重，保护机器

D.使计算机能正常工作

E.不开窗户，避免灰尘进入

答案

参考答案：D

选择题

— Everything goes well, ____?

— Not really. [ ]

A. does it

B. doesn't it

C. do they

D. don't they

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单项选择题

Impostion of a discriminating duty belongs to the tariff rates falling into the category of ______.

A．general rates

B．preferential rates

C．ad valorem duty rates

D．special duty rates
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