发布时间:2025-01-31 07:12:31
已知电线电阻R,输出功率P,输出电压U损耗功率=(P/U)^2*R若已知电线长度L,和电线每米电阻p,输出功率P,输出电压U损耗功率=(P/U)^2*L*p
想要开一家安踏鞋专卖店应该怎样进货大约需要多少资金才能开起店来
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