试述平整机四列圆柱滚子轴承内圈的安装程序。

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问题:

试述平整机四列圆柱滚子轴承内圈的安装程序。

考点:冷轧工考试冷轧工考试题库
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在△ABC中,已知(a+b+c)(a+c﹣b)=3ac.

(1)求角B的度数;

(2)求2cos2A+cos(A﹣C)的取值范围.

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短文改错(共10小题;每小题1分,满分10分)

Dear friends,

I’m awfully sorry to hear that a horrible but severe earthquake unexpected hit your hometown. Facing the rarely-seen disaster, we remain so calm and strong –willed that we are all moved to tear. A friend in need is a friend indeed. Think about your present situation, we can wait a minute to make every bit of effort to help you. I, as a chairman of the Students’ Union, on behalf of all my schoolmates, express our most sincerely pity and care for you. Besides, we have made donation of 120,000 yuan to you, expecting that it can help you go through the difficult. A better hometown can rebuilt. Remember we won’t be far away when you need any help.

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松树与苹果树相比,最主要的不同是(  )

A.果实内有种子

B.终年常绿,不落叶

C.没有果实,种子裸露

D.松果有果皮保护

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BEIJING - China will build a nation-wide network within three to five years to monitor the impact of air pollution on health, a latest step to deal with a persistent smog crisis in big cities, an official said.

A total of 43 monitoring spots will be set up in 16 provinces and municipalities frequently engulfed by smog so as to facilitate research on air pollutants in different regions, the impact on the health of vulnerable groups and the study of related diseases, said Xu Dongqun, an official with the Chinese Center for Disease Control and Prevention.

With funds allocated by the central government, the study will provide reference for preventive efforts to reduce the PM 2.5, Xu said.

Thick and dangerous smog have hit 17 provinces and municipalities with a population of 600 million this year. One of the major cities is Beijing, which has been shrouded in smog for several days during the ongoing seven-day national holiday in 2013.

China recently issued a 1.75 trillion-yuan (284.2 billion U.S. dollars) plan to deal with the worsening air, improving air quality within five years in order to decrease the number of heavily polluted days and improve the air in major city clusters.

小题1: China will build a nation-wide network in order to_________.

A.monitor the impact of air pollution on health

B.improve air quality

C.improve air pollution

D.increase the PM 2.5小题2:The underlined word “persistent” means“________”.

A.短时的

B.持久的

C.短暂的

D.停留的小题3: China will take measures to deal with air pollution except________.

A.China recently issued a 1.75 trillion-yuan (284.2 billion U.S. dollars) plan

B.set up monitoring spots in 16 provinces and municipalities

C.improveliving standard

D.improve the air in major city clusters小题4: We can infer from the paragraph________.

A.Thick and dangerous smog have hit 17 provinces and municipalities

B.air pollution impacted a population of 600 million this year

C.The people in Beijing probably wore masks when they walked on the street during the national holiday in 2013.

D.the study will provide reference for preventive efforts to reduce the PM 2.5

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党的十七大报告上胡 * * * * 将“建设富强民主文明的社会主义现代化国家”的奋斗目标拓展为“建设富强民主文明和谐的社会主义现代化国家”。 下列符合构建和谐社会要求的举措有[ ]

①南通建立社会大调解机制,妥善处理各种矛盾    

②实施西部大开发战略

③弘扬时代精神和创新精神    

④减免九年制义务教育阶段学生的学杂费

A、①②③    

B、②③④    

C、①③④    

D、①②③④

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