一段导线均匀拉长为原来的2倍则导线的电阻将 A.是原导线电阻的2倍 b.是原导线电阻的 c.是原导线电阻的4倍 D.是原导线 Template




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tomski一段导线均匀拉长为原来的2倍则导线的电阻将 a.是原导线电阻的2倍 b.是原导线电阻的 coloring