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当前学科：安全生产知识竞赛
题目：
单选题
装配起爆药卷工作，专用的房间距井筒、厂房、建筑物和主要通路的安全距离必须符合国家有关规定，且距离井筒不得小于（）米。
A
20
B
50
C
25
D
10
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