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| 潜孔钻冲击器 | |||
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| 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 | |||
| 潜孔锤; 潜孔冲击钻机 | |||
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| 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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