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通过实践练习得出曲轴一般会出现哪些问题，并具体说明检测项目？

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当曲轴主轴颈与轴承间配合间隙过大时，简述具体原因的诊断方法并及维修方法。

简述曲轴主轴颈与轴承间的间隙测量方法。

[音频]26. A) Monitor students’ sleep patterns.B) Help students concentrate in class.C) Record students’ weekly performance.D) Ask students to complete a sleep report.27. A) Declining health.B) Lack of attention.C) Loss of motivation.D) Improper behavior.28. A) They should make sure their children are always punctual for school.B) They should ensure their children grow up in a healthy environment.C) They should help their children accomplish high-quality work.D) They should see to it that their children have adequate sleep.

请谈谈什么是中央一号文件，最新的中央一号文件的名称是？