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你不出拳,,怎么賺錢,? |
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點(diǎn)評
看受力點(diǎn),,受力點(diǎn)在支座上,,就沒有彎矩,只要有偏離,,就一定有彎矩 ,,具體多少,要建立聯(lián)立方程解一下,,你看理論力學(xué)吧,,寫的很清楚,我不多啰嗦了,謝謝
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