rock bit
短语词组
- 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