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