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關注：1
2013-05-23 12:21
求翻譯：the electric potential difference due to a point charge is 4.8v at a distance of 4.2cm from the charge是什么意思？ 待解決
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- 離問題結束還有
the electric potential difference due to a point charge is 4.8v at a distance of 4.2cm from the charge
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