safety pin chain 中文意思是什麼
safety pin chain
解釋
安全銷吊鏈-
Locking pin on the gantry and bolts of a sprocket chain, which are the approved safety devices to avoid uncontrolled movement of
事發時,原定用以防止鋼陣移位的兩項安全裝置(定位鎖及扣齒鏈螺栓)未有裝上。
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