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to phrases
down-the-hole hammer
expl.
潜孔钻机
以冲击器潜人孔内直接冲击钻头破岩的钻孔机械。它的特点是钻杆传递冲击能的过程没有能量损失,钻孔深度对钻速的影响小,工作噪声低
tech.
潜孔锤
;
潜孔冲击钻机
down the hole hammer
expl.
潜孔钻冲击器
down-the hole hammer
earth.sc.
潜孔锤
down-the-hole hammer:
3 phrases
in 3 subjects
Hydroelectric power stations
1
Oil / petroleum
1
Technology
1
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