短語詞組短語rock -bit interaction model 巖石hydraulic rock -breaking bit 水力破巖鉆頭Screw Threads for Detachable Rock -Bit 活動鑿巖鉆頭用螺紋tri -cone rock bit 三牙輪鉆頭roller -type rock bit 牙輪鑿巖鉆頭nonself -cleaning rock bit [油氣]非自潔式牙輪鉆頭full -hole rock bit 全斷面無巖心鉆頭 返回 rock bit