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【单选题】
如图1) 所示,给出了电压和电流的相量图,从相量图可知( )。
A.
有效值 U ＞ I
B.
电流电压的相位差为 15 °
C.
电流超前电压 75 °
D.
电压的 30 °
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【单选题】What does the writer of this passage want tell readers?
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