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问题 单项选择题

我国工频交流电的周期为（）秒。

A、0.01

B、0.02

C、0.05

D、0.1

答案

参考答案：B

选择题
We were supposed to move into our new classroom building at the beginning of this month，but things didn’t ________ as planned.
A．work outB．carry out
C．move outD．get out
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问答题

请列举出在合成纤维中被俗称为 “六大纶”的物质名称。

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