A.A组先 B.B组先 C.A、B两组同时
A.1.2m B.1.8m C.1.9m D.1.3m
A.0.5m B.1.2m C.1.5m D.1.8m
A.0.2m3 B.0.5m3 C.0.6m3
A.10% B.15% C.20%