短语词组短語bit uniform wear 鑽頭正常磨損bit bearing wear equation 軸承磨速模式bit gage wear 鑽頭直逕磨損bit gauge wear 鑽頭直逕磨小bit excessive wear 鑽頭過度磨損bit t wear 鑽頭磨損drilling -bit wear 刀具磨損 返回 bit wear