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percussion tools
eng.geol. 冲击钻具
percussion tool
dril. 顿钻钻具; 冲击钻钻具
oil 冲击钻具
tech. 冲击工具; 冲击钻进钻具; 冲击钻进工具
percussion tools: 3 phrases in 2 subjects
Engineering geology2
Technology1

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