We don’t want to_____him as chairman of the meeting. He is not fit for the position.

A．consider

B．pick

C．refer

D．appoint

在分配柱色谱中，分配系数K值小的组分（）

A.被吸附得不牢固

B.在流动相中浓度低

C.移动速度慢

D.移动速度快