A.1~2m3/(m2•h) B.1.5~3.0m3/(m2•h) C.1~1.5m3/(m2•h) D.1~3.0m3/(m2•h)
A.三 B.四 C.五 D.六
A.50%~60% B.60%~70% C.70%~80% D.80%~90%