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Terms for subject Explosives and Explosive Ordnance Disposal containing | all forms
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在…旁边by
充填沿空留巷时,巷道采空区一侧进行充填形成条带的护巷方法road side packing
支护沿空留巷时,在采空区一侧设置支护物的护巷方法road side supporting
支护沿空留巷时,在采空区一侧设置支护物的护巷方法road side supporting
侧炮孔offset hole