4970| 4
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中国国家标准《机械卷》全套 |
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点评
有圆弧齿的同步带国家标准吗?齿形为8YU和5GT
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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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