The reason is the borehole drilled by eccentricity PDC bit is over diameter.ROP is improved and the cost of drilling will be lowed as a result of using eccentricity PDC bit.是什么意思_The reason is the borehole drilled by eccentricity PDC bit is over diameter.ROP is improved and the cost of drilling will be lowed as a result of using eccentricity PDC bit.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句