昨天在进行双坡采光顶计算的时候，计算惯性矩的时候需要用面域差集，对于面域不是很了解，因为我一直是做工程制图，很少用到面域，上网查了一下，实际操作正确，记录下，以加深印象！
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- Title: Lv369's忆楼阁
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- Registered On: November 14, 2015, 6:11 am
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