单项选择题
A.25kPa B.101.3kPa C.250kPa D.217kPa
A.7.5 B.6.5 C.小于6.5 D.大于7.5
A.>25.3% B.=25.3% C.<25.3% D.接近100%
A.KNO3和NaCl B.NaNO3和BaCl2 C.K2SO4和Na2SO4 D.NH3·H2O和NH4Cl
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