A.0.81,0.80 B.0.80,0.18 C.0.18,0.81 D.0.81,0.18
A.1000mL含Na2CO3 212g B.500mL含Na2CO3 212g C.1000mL含Na2CO3 106g D.500mL含Na2CO3 53g
A.0.6% B.6g/L C.6+1 D.6:1