A.0.05mg/L,0.1mg/L B.0.1mg/L,0.1mg/L C.0.1mg/L,0.05mg/L D.0.05mg/L,0.05mg/L
A.Hs- B.Fe3+ C.HPO32- D.HCO3-
A.4-10mm B.2-4mm C.0.5-2mm D.0.25-0.5mm