题目内容

要实现有源逆变,逆变角β应__________。

A. >90°
B. <90°
C. >α
D. <α

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两个电源同极性相连,称为__________,相当于两个电源电动势相互__________。

A. 顺串;叠加
B. 顺串;抵消
C. 逆串;叠加
D. 逆串;抵消

We always have for lunch.

A. /,/
B. the, /
C. /,a
D. the,the

elephant is heavier than horse.

A. /,/
B. An,the
C. An,a
D. /,the

It took me hour and half to finish work.

A. a,a,a
B. an,a,a
C. an,a,the
D. an,a./

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