A.5000左右 B.4000左右 C.3000-4000 D.2000-3000 E.2500-3500
A.1.5mg/L B.1.8mg/L C.2mg/L D.2.5mg/L E.2.8mg/L
A.6~8 B.6.5~8.5 C.5.5~8.5 D.5~9 E.5.5~9