短語詞組短語diamond core drill bit 金剛石鉆頭two core per bit 每位兩個磁心core -bit tap 打撈金剛石取心鉆頭的公錐core drilling bit 取心鉆頭diamond core boring bit 金剛石空心鉆頭;金剛石套料鉆core drill bit 巖芯鉆頭core cone bit 牙輪取心鉆頭Core Box Bit 圓底刀 返回 core bit