A.40% B.50% C.60% D.70%
A.0.02～0.03MPa B.0.05～0.07MPa C.0.08～0.01MPa D.0.12～0.14MPa
A.增加自由面 B.保证巷道形状 C.增加破碎度 D.便于装岩
A.0.45MPa B.0.5MPa C.0.55MPa D.0.6MPa
A.10% B.15% C.20% D.25%
