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【简答题】
求图所示电路中1.4V电压源发出的功率P 1 和0.5A电流源的功率P 2 。
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A.
正确
B.
错误
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A.
He will finish the paper rafter playing basketball.
B.
He hasn't finished doing his assignment yet.
C.
He stays in the dormitory with his roommates.
D.
He is playing basketball with his roommates.
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A.
0A
B.
6A
C.
2A
D.
3A
【单选题】The voltage regulator controls the current through _____.
A.
The generator brushes
B.
The rotor
C.
The generator field
D.
All of the above
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【简答题】晶闸管三个电极分别是阳极、阴极和[填空(1)]极，具有[填空(2)]性。A. 门（或控制）B. 单向可控导电
【单选题】The voltage across an inductor leads the current through it by .
A.
0 °
B.
90 °
C.
-90 °
D.
180 °
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