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