(2007)各物质浓度均为0.10mol/dm3的下列水溶液中,其pH最小的是:[已知(NH3)=1.77×10-5,(CH3COOH)=1.76×10-5]()
A:NH4Cl
B:NH3
C:CH3COOH
D:CH3COOH+CH3COONa
出自:基础考试