單項選擇題
A.0.02,0.2 B.0.05,0.5 C.0.08,0.8
A.20cm,較大 B.30cm,較大 C.20cm,較小
A.5,10 B.10,15 C.15,20
A.氣態(tài)HNO3 B.氣態(tài)NH3 C.氣溶膠中的NH4+
A.1,60B.2,70C.3,80