問題詳情
27. 通以電流的螺線形線圈，在線圈中放入下列哪一種物品，可以增加磁力？
(A)鋁棒
(B)銅棒
(C)鐵釘
(D)玻璃棒。
(A)鋁棒
(B)銅棒
(C)鐵釘
(D)玻璃棒。
參考答案
答案：C
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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