A.0.05mg/L B.0.10mg/L C.0.20mg/L D.0.30mg/L E.0.50mg/L
A.3mg/L B.5mg/L C.6mg/L D.9mg/L E.10mg/L
大氣標(biāo)準(zhǔn)S02的l小時平均濃度限值是()
A.0.06mg/m3 B.0.50mg/m3 C.0.15mg/m3 D.0.20mg/m3 E.0.10mg/m3