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