top chuck 中文意思是什麼
top chuck
解釋
上軸承座-
The drive chuck and top sub are threaded into the cylinder with right - hand threads. the drill must be alway soperated with right - hand rotation
因為沖擊器的接頭和接頭都是右旋螺紋,所以鉆進工作過程中,應始終保持沖擊器右迴旋。
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