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怎样计算英制螺纹1/2-20UNF-2A的螺纹牙根部距离？急！！ |
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小黑屋|手机版|Archiver|机械社区 ( 京ICP备10217105号-1，京ICP证050210号，浙公网安备33038202004372号 )
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发表于 2011-2-23 12:22:48