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【单选题】
某交流用电器的额定电压为 220V 、额定频率为 50Hz ,其两端加上下列哪种正弦电压,会保证其工作正常?A.
u=-220 sin314tV
B.
u=220sin314tV
C.
u=380sin314tV
D.
u=-220 sin50tV
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A.
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B.
充要条件
C.
必要不充分条件
D.
既不充分也不必要条件
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A.
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B.
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Someone had a fever.
D.
Someone had a nosebleed.
E.
Someone hurt his back.
F.
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