The separation of solids from a suspension in a liquid by means of a porous medium or screen which retains the solids and allows the liquid to pass is termed filtration.
选项：

A:过滤是一种分离方法,多孔介质过滤液体;
B:通过多孔介质或滤网把固体留下而让液体通过来把液体中悬浮的固体分离出来的方法称为过滤;
C:
D:通过多孔介质或滤网把液体通过来把液体中悬浮的固体分离出来;