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兩根導桿如何固定在三個點上,,形成一個可改變底邊長度的三角形結(jié)構(gòu) |
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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(wǎng)安備33038202004372號 )
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