11594| 21
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腰孔的标注 |
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点评
我这2种都对,机械制图手册上都有。一个从工艺视角,一个从质检视角
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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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