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[交流] [高考]超电磁炮的原理 |
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发表于 2011-6-11 10:49:21
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发表于 2011-6-11 11:10:33
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发表于 2011-6-11 17:10:06
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而且是25°C的三倍音速。我现在估计会忘记选D吧。
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发表于 2011-6-11 17:21:14
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