液-液萃取法中,为提高萃取率,较好的方法是

A、按"少量多次"原则萃取
B、V[img=~/QImg/2013-10-14-10-14-34/image016.jpg]>V[img=~/QImg/2013-10-14-10-14-34/image017.jpg]
C、选择有较大D值的萃取溶剂
D、V[img=~/QImg/2013-10-14-10-14-34/image016.jpg]=V[img=~/QImg/2013-10-14-10-14-34/image017.jpg]