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【单选题】
每次相邻崩落落矿爆破前，为获得合理的补偿空间，需要对前次压实矿松动出矿（）。A.
5%-10%
B.
10%-15%
C.
15%-20%
D.
20%以上
拍照语音搜题，微信中搜索"皮皮学"使用
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