3270| 8
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兩端是滑動(dòng)軸承的支撐梁,軸承處是否有彎矩作用? |
評(píng)分
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點(diǎn)評(píng)
其實(shí)都一樣力的作用是相互的
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點(diǎn)評(píng)
所以的結(jié)構(gòu)當(dāng)然已經(jīng)包括了所以
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