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動(dòng)態(tài)環(huán)境下的受力分析 |
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點(diǎn)評(píng)
實(shí)在
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點(diǎn)評(píng)
終于看到個(gè)靠譜的,撐桿只有在到達(dá)右端極限位置才有支撐力,不然哪有支撐力,瞎研究啥呢
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