問題詳情
21. 在溫度不變的情形下，將一金屬線的長度均勻拉長為原來的 3 倍，則其電阻變為原來的多少倍？
(A) 1
(B) 3
(C) 6
(D) 9
(A) 1
(B) 3
(C) 6
(D) 9
參考答案
無參考答案
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