在高效液相色谱法中正相色谱法是（）.

A.固定相为极性，流动相为极性

B.固定相为极性，流动相为非极性

C.固定相为非极性，流动相为极性

D.固定相为非极性，流动相为非极性

E.固定相为键合型离子交换树脂，流动相为极性

What is meant by the term overhaul in firefighting?（）

A.Slow down the spread of fire by cooling adjacent structures

B.Cover the fire with foam

C.Smother the fire with a blanket or similar object

D.Break up solid objects to ensure that any deep seated fires are extinguished