A.7%KNO3,40%NaNO2,53%NaNO2 B.7%NaNO2,40%NaNO3,53%KNO3 C.7%NaNO3,40%KNO3,53%NaNO2 D.7%NaNO3,40%NaNO2,53%KNO2
A.0.34 B.0.44 C.0.24 D.1.34
A.80KPa B.101.3+80KPa C.101.3-80KPa D.760-80KPa