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| 岩石硬度 | |||
| 岩石硬度岩石抵抗工具侵人其表面的能力指标。它是影响机械方法破碎岩石效果的基本量值。按测量方法不同，主要有刻划硬度、压人硬度和回弹硬度三种 | |||
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hardness of rock : 7 phrases in 2 subjects |
| Explosives and Explosive Ordnance Disposal | 1 |
| Technology | 6 |
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