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【单选题】
感性电路中,电压电流的相位关系为 。A.
电压比电流超前
B.
电压比电流滞后
C.
电压和电流同相
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【简答题】阅读理解。 In London, there has always been a main problem. In order to solve this problem, the government has decided to have a bike revolution (革命). It has decided to provide 6,000 bikes for the people t...
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