hard facing of tool joint的意思|示意
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钻杆接头表面加硬层
hard facing of tool joint的网络常见释义
钻杆接头表面加硬层 ... hard facing metal 敷焊用硬金属；表面硬化金属 hard facing of tool joint 钻杆接头表面加硬层 hard formation cutting head 硬地层钻头 ...