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【单选题】
中脉压的正常值为( )A.
3-5cmH2O
B.
4-12cmH2O
C.
5-15cmH2O
D.
8-12cmH20
E.
6-14cmH2O
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【单选题】Symmetrical three-phase circuit is shown in the figure, the known parameters are as follows, then the reading of the power meter 1 is W1=_____W, the reading of the power meter 2 reads W2=_______W. C...
A.
190W,190W
B.
190W,380W
【单选题】In the illustrated circuit, us=100cos100t V, the active power (the average power)on the load is P=UIcos φ =6W, the reactive power of the load is Q=UIsin φ =8var. We can find out that the apparent powe...
A.
6uF
B.
8uF
C.
12uF
D.
16uF
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