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caving method

expl. 崩落采矿法; 垮落法使采空区顶板垮落的岩层控制方法
jewl. 落顶法; 塌陷法
mineral. ★ 垮落法
mining. 崩落开采法
★ 崩落采矿法
caving method
: 14 phrases in 4 subjects
Explosives and Explosive Ordnance Disposal2
Mining3
Scientific1
Technology8

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