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J | Definition of J at Dictionary.com
J表示转动惯量，又称惯性距、惯性矩。即构件中各质点或质量单元的质量与其到给定轴线的距离平方乘积的总和。 或者是，面积或刚体质量与一轴线位置相关联的量，是面积微元或组成刚体的质量微元到某一指定轴线距离的二次方的乘积之积分。
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