pilot holes 中文意思是什麼
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Since the inception of this project in 1998, three pre - pilot holes have been completed and the main hole has reached a depth of over 3500 m
從98年開始,已經完成3個預先導孔的鉆探工作,主孔鉆進深度已經超過3500米。 -
Machine tool components - method for determination of the pilot diameter of 60 centre holes
機床零件. 60中心孔導向桿直徑測定方法
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