advance cone 中文意思是什麼
advance cone
解釋
前進錐-
But now the use of the spherical one - cone bit shows that the teeth are abrade heavily in advance, which affects the velocity and life of the bit
但是目前油田上使用的球形單牙輪鉆頭由於牙齒先期磨損嚴重,影響了鉆頭的機械鉆速和壽命。
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