A.2.5-3mg/L B.2.5-3.5mg/L C.2.8-3.8mg/L D.2.8-3.5mg/L
A.0.1-0.2mg/L B.0.1-0.15mg/L C.0.15-0.2mg/L D.0.12-0.15mg/L
A.II、II B.II、III C.III、II D.III、III