sanmaosjy 发表于 2017-11-28 08:51:05

JIS B 0121:2012 International gear notation -- Symbols for geometrical data

JIS B 0121:2012  International gear notation -- Symbols for geometrical data

admin 发表于 2017-11-28 12:40:57

谢谢您的分享，金币已奖励!
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