precision-machined surface 中文意思是什麼
precision-machined surface
解釋
精加工平面-
Rolls machined from high - grade tool steel, which has been treated to a hardness of over 60 rockwell c and hard chromed, precision ground as well as polished to a mirror surface
輥由高級工具鋼製成,經過熱處理,洛氏硬度超過60 ,並經鍍鉻和鏡面拋光處理。
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