短語(yǔ)詞組短語(yǔ)roller r bit 牙輪鑽頭roller bearing bit 滾柱軸承鑽頭roller cone bit 牙輪鑽頭roller cutter bit 牙輪鑽頭cross roller rock bit 十字形四牙輪鑽頭sealed roller bearing bit 密封滾動(dòng)軸承鑽頭roller core bit 取心牙輪鑽頭roller -bit hole rig 牙輪鑽機(jī) 返回 roller bit