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| 最佳抵抗线使钻孔、爆破、堵塞、运输和破碎的综合成本最低时所对应的抵抗线,单位为m; 优化负荷从凿岩、爆破、装载、运输和破碎几方面考虑成本最低的崩落距离，单位为 m | |||
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optimum burden : 4 phrases in 1 subject |
| Explosives and Explosive Ordnance Disposal | 4 |
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