6317| 5
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齿轮的左旋和右旋怎么判断? |
点评
正解,和螺纹一样看。
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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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