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一公分钢板一平方多重_家居日记
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一公分钢板一平方多重

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一公分钢板一平方多重 有78.5公斤重；因为钢板的重量等于密度乘于厚度乘以面积，已知钢的密度为7.85克每立方厘米，厚度为1公分，面积为10000平方厘米，带入


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