... 凸轮传动cam drive 凸头螺丝raised head screw 加成功课;新增法addition process ...
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raised countersunk head screw 半沉头螺钉
raised head machine screw 突头机器螺钉
slotted raised countersunk head screw 开槽半沉头螺钉
recessed raised countersunk-head self-cutting screw 十字槽凸头埋头自攻螺钉
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