短语词组短語diamond core drill bit 金剛石鑽頭two core per bit 每位兩個磁心core -bit tap 打撈金剛石取心鑽頭的公錐core drilling bit 取心鑽頭diamond core boring bit 金剛石空心鑽頭;金剛石套料鑽core drill bit 巖芯鑽頭core cone bit 牙輪取心鑽頭Core Box Bit 圓底刀 返回 core bit