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问题 多项选择题

应尽量避免空载线路（或空载变压器）产生2次谐波谐振的（）以及防止在故障时出现该种谐振的接线。

A.使用方式

B.运行方式

C.操作方式

D.结构形式

答案

参考答案：B, C

选择题
I'm sure he would love _____.

A. come
B. to come
C. coming
D. too
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选择题

I received a call one morning from a lady, but she phoned________, as she kept asking to speak  to someone else who I didn’t know at all. 

A．by accident

B．by mistake

C．by chance

D．by force
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