8071| 26
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受力情况如图所示。我们这还是凭经验做,领导说用50角钢,我感觉很悬 |
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小黑屋|手机版|Archiver|机械必威体育网址 ( 京ICP备10217105号-1,京ICP证050210号,浙公网安备33038202004372号 )
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