29. A method of separation that employs a system with two phases of matter, a mobile phase and a stationary phase, is called !
(A) filtration.
(B) chromatography.
(C) distillation.
(D) vaporization.
(E) homogenization.

答案：登入後查看
統計： A(0), B(9), C(1), D(1), E(0) #1121884