单项选择题

直流潮流只能计算有功功率和电压相角，不能计算电压幅值。
A、正确
B、错误

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_________ the afternoon of March 8, the woman in the city had a big party.A. ToB. InC. AtD. On

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Thegreatest risk to bicyclists is during the green intervals. ( ) A、正确 B、错误

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