A.礦井型選煤廠 B.群礦型選煤廠 C.礦區(qū)選型煤廠 D.用戶選煤廠
A.1:0.25:0.4:0.3 B.1:0.2:0.4:0.3 C.1:0.25:0.35:0.3 D.1:0.25:0.3:0.25
A.0.2 B.0.3 C.0.4 D.0.5