4117| 4
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求結構的幾何截面的慣性矩,,慣性積,,極慣性矩,靜矩,,主慣性軸,,都跟實際有什么意思。 |
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小黑屋|手機版|Archiver|機械社區(qū) ( 京ICP備10217105號-1,,京ICP證050210號,浙公網安備33038202004372號 )
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