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【单选题】
已知某正弦电压的频率f=50Hz 初=30,有效值为100V,则其瞬时表达式可为()。A.
u = 100 sin( 50t+30Φ
B.
u = 141.4 sin( 50t+30Φ
C.
u = 200 sin( 100t+30Φ
D.
u = 141.4 sin( 100t+304Φ
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举一反三
【单选题】We shall call on her as soon _____.
A.
as she will come
B.
as she came
C.
as she comes
D.
she comes
【单选题】We shall call on her as soon ______.
A.
as she comes
B.
she comes
C.
as she shall come
D.
as she will come
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