在无色透明溶液中,能大量共存的离子组是
A.Mg2+、Na+、SO42-
B.K+、H+、HCO3-
C.Cu2+、NO3-、SO42-
D.Ba2+、NO3-、CO32-
答案:A
As the displacement of a vessel increases, the detrimental effect of free surface().
A.increases
B.decreases
C.remains the same
D.may increase or decrease depending on the fineness of the vessel's form
分馏法通过()来实现。
A.提高组分蒸气压
B.降低组分蒸气压
C.提高组分饱和蒸气压
D.降低组分饱和蒸气压