A.1/200~1/300B.1/400~1/80C.1/500~1/900D.1/600~1/1200
A.0.5~1.0B.1.0~1.5C.1.5~2.0D.2.0~2.5
A.邻孔聚能作用B.形成平整开挖面C.减少装药量D.增大爆破效果