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称重
提问: 一个物体在岸上称重,和在水中沉重重量一样嘛? 这个问题可以衍生到,一公斤铁和一公斤棉花到底谁的质量大。
问与答
•
azure
•
Sep 13, 2012
• Lastly replied by
glume
40
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