straight key for big gearwheel的意思|示意
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直键大齿轮
straight key for big gearwheel的网络常见释义
大齿轮用平键 ... straight key way milling cutter 直柄键槽铣刀 straight key for big gearwheel 大齿轮用平键 straight key for worm gear 涡轮用平键 ...