[問題] 磁場
Magnetic field lines have north and south poles as their sources.
請問要如何解釋上面這一句是錯的?謝謝
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05/11 14:57, , 1F
05/11 14:57, 1F
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05/11 14:58, , 2F
05/11 14:58, 2F
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05/11 15:33, , 3F
05/11 15:33, 3F
推
05/11 23:10, , 4F
05/11 23:10, 4F
推
05/11 23:15, , 5F
05/11 23:15, 5F
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