现有15mol/l(密度为0.90g/cm^3)和4mol/L(密度为0.98g/cm^3)的两种氨水,欲配置6mol/L(密度为0.96g/cm^3)的氨水,需上述两种氨水的体积约为(答案是D,)
A2;9B4:15C11:60D17:75