... 工具设备 tool equipment 工具失效 tool failures 工具使用寿命 tool life ...
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The failure of collar connection thread is one of the prime drill tool failures.
石油钻铤螺纹联接失效是钻具失效的主要类型。
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But even on purely economic grounds, death taxes are spectacular failures as revenue raisers or a tool of income redistribution.
WSJ: Review & Outlook: Death Tax Defying
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