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Hand Tooling

1、常用手工具

- 常用手工具(hand tooling)的介绍及使用方法螺丝/ 螺栓 ( Screw )/丝帽(Nut)/介子(Washer)螺丝(screw)的原理是利用其螺丝纹将多过一件的工件作固定及紧紧地...

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