counterboring 中文意思是什麼
counterboring
解釋
擴鉆-
Counterboring drill press
平底擴孔鉆床 -
Manufacturing processes chip removal - part 2 : drilling, countersinking and counterboring, reaming ; classification, subdivision, terms and definitions
排屑加工工藝.第2部分:鉆孔鉆沉頭孔和鍃沉頭孔鉸
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