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Explosives and Explosive Ordnance Disposal
containing
超 声频
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in specified order only
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超声频
振动钻孔
在回转式钻机的钻凿面上,垂直施以超声频振动进行钻孔的方法。在这种情况下,钻头周围的岩石在超声频的振动下完全被破碎,摩擦阻力低,钻具极易贯人岩石,所以不需要很大的轴向推力,且能钻凿较深的炮孔
ultrasonic vibration drilling
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