12. Consider the following procedural steps: 1. ground an electroscope. 2. remove the ground from the electroscope. 3. touch a charged rod to the electroscope. 4. bring a charged rod near, but not touching, the electroscope. 5. remove the charged rod. To charge an electroscope by induction, use the sequence:
(A) 1, 4, 5, 2
(B) 4, 1, 2, 5
(C) 3, 1, 2, 5
(D) 4, 1, 5, 2
(E) 3, 5
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統計: 尚無統計資料
統計: 尚無統計資料