... percussion drill 冲击钻井；冲击式钻机 percussion tool 冲击钻具 percussion welding 冲击焊 ...
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... percussion drilling 冲击钻 percussion tool 冲击工具 percussion lock 击发装置 ...
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percussion tool drilling 顿钻钻井法
percussion tool weight 冲击钻具重量
hydraulic percussion tool 液动射流式冲击器
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N a power driven tool which operates by striking rapid blows: the power may be electricity or compressed air 冲击工具
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