A.3 B.5 C.7 D.10
A.15~50m B.50~80m C.60~150m D.200~300m
A.CH4 B.CO2 C.SO2 D.NOx
A.升高,降低,升高 B.降低,升高 C.升高,降低 D.降低,升高,降低
A.90% B.99% C.99.9% D.99.99%