游客 113.240.253.x 发表于 2017-7-17 08:43 螺栓的 3x0.9x2x0.35x150=283.5KN 双角钢受拉 215X(4875-2X24X10)/(1-0.5/3)=1133.9 选小
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手机版|小黑屋|第一证书
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