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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
expl. optimum burden
优化 负 荷
: 7 phrases in 4 subjects
Ecology1
Explosives and Explosive Ordnance Disposal3
Technology2
Water resources1

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