单项选择题

A.1.0mol/LCH3COOH-0.1mol/L CH3COONa
B.0.1mol/LCH3COOH-1.0mol/L CH3COONa
C.1.0mol/LCH3COOH-1.0mol/L CH3COONa
D.0.1mol/LCH3COOH-0.1mol/LCH3COONa