在滑动轴承中，不允许出现（）状态。A、干摩擦 B、边界摩擦 C、液体摩擦 D、半液体摩擦 发布时间：2020-04-10 03:24 │ 来源：www.tikuol.com 题型：单项选择题 问题： 在滑动轴承中，不允许出现（）状态。A、干摩擦B、边界摩擦C、液体摩擦D、半液体摩擦
题型：单项选择题 阅读理解 I am Paul Black. I'm an English boy. And I'm 13. I'm in China with my parents. 1_His name is Guo Qiang.On weekends I often watch TV with him.My favorite movie star is Jackie Chan. He is a great actor.His movie The Forbidden Kingdom (功夫之王)is successful. 2 I think it's great.But GuoQiang likes Liang Chaowei.He likes the movie Red Cliff (赤壁). Liang Chaowei is in it. It's an action movie,too, He likes it very much. 3 Guo Qiang also likes comedies.He often tells me,"Comedies are really fun! " 4 And he wants to be an actor.A. It's an action movie.B. My brother Mike likes them, too.C. But I don't like it,because I think it's borirg.D. I have a good Chinese friend.5. What kind of movies does Mike like?A. Comedies. B. Thrillers. C. Action movies. 查看答案
题型：单项选择题 下列化学方程式能正确表示所述内容的是 A．酸雨的形成：CO2 + H2O＝H2CO3B．中和反应：H2SO4+MgO＝MgSO4+H2OC．Fe和盐酸反应：2Fe+6HCl＝2FeCl3+3H2↑D．研究水的组成：2H2O通电2H2↑+O2↑ 查看答案