题目内容

I suppose no one has any idea who _________ the story?

A. originate
B. originator
C. originated
D. originating

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It was always _________ lamb and canned peas for Sunday lunch.

A. roast
B. roasted
C. roasts
D. roasting

I personally would rather _________ a chicken whole.

A. roast
B. roasts
C. to roast
D. to be roasted

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A. 波形相同
B. 幅值相同
C. 频率相同
D. 相序相同
E. 相位相同
F. 电流相同

风力异步发电机并入电网运行时，要求：

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B. 转速接近同步转速
C. 比同步转速高
D. 比同步转速低