试述β-环糊精包合物在制剂中的应用。

I am sure David will be able to find the library - he has a pretty good ____ of direction.

A．idea

B．feeling

C．experience

D．sense

粗粒浮选宜采用（）。

A、浓矿浆

B、稀矿浆

C、深槽浮选机

With their help, we finished the work with _______ people and ______ time.

A．fewer; less

B．less; less

C．less; fewer

D．fewer; fewer

企业对员工进行职业责任教育和培训费时费力费钱，会妨碍企业发展。

辛亥革命后的中国社会性质是（）