一粗细均匀的镍铬丝，把它拉制成原来直径的的均匀细丝后，它的电阻变为原来的n倍，则n为

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一粗细均匀的镍铬丝，把它拉制成原来直径的

的均匀细丝后，它的电阻变为原来的n倍，则n为（　　　）

A：

B：

C：100

D：10000

上一题下一题 0.0难度选择题更新时间:2018-06-28 09:01:24

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D

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