rock bit

短语词组

短语

• rock -bit interaction model 岩石
• hydraulic rock -breaking bit 水力破岩钻头
• Screw Threads for Detachable Rock -Bit 活动凿岩钻头用螺纹
• tri -cone rock bit 三牙轮钻头
• roller -type rock bit 牙轮凿岩钻头
• nonself -cleaning rock bit [油气]非自洁式牙轮钻头
• full -hole rock bit 全断面无岩心钻头
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