shaft boring

短语词组

短语

• shaft t boring 钻井
• Shaft boring machines 矿用钻井机
• shaft sinking by boring 钻井法凿井
• shaft boring detail 竖井钻进
• shaft boring machine 竖井掘进机
• shaft boring through clay layer 粘土层钻井
• full face shaft boring machine 竖井钻机
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