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

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、只能承受径向载荷,不能承受轴向载荷D、不确定

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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

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

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I hurt my knee, so I stopped _______ football last

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

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I started looking after these plants whose host we

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

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A: This is Frank speaking. I would like to speak w

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

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