选择题：向心推力轴承（ ）。A、可同时承受径向载荷和轴向载荷B、只能承受轴向载荷，不能承受径向载荷C、只能承

n个变量的最小项是n个变量的“ 项”，其中每个变量都以原变量或 变量的形式出现一次。对于任何一个最小项，只有一组变量取值使它为 ，而变量的其余取值均使它

I hurt my knee, so I stopped _______ football last month.A、playingB、playC、to pla

I started looking after these plants whose host went out to have a holiday.A、正确B

A: This is Frank speaking. I would like to speak with Mr. Wang, please. B: I’m a

Is she still angry _______what Tom has done?A、toB、withC、about