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机械检修的主要内容有哪些方面？

答案

参考答案：

（1）发现故障征兆和已出故障，通过分析判断查明原因，确定检修对策。

（2）更换已失效的或不宜修复的零、部件。

（3）通过修复消除零部件的缺陷，或抑制、减缓初期缺陷的发展进程，改善现有状。

（4）采用新结构、新材料、新技术对原有设备中的不足部分或落后方面进行改进，以改善和提高设备的素质。

问答题

概述20世纪初欧洲在世界上优势地位的主要表现，并分析第一次世界大战对这种优势地位的影响。
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填空题

Beijing: The United States and North Korea had their first ________in four months here this afternoon as part of the ________negotiations on how to end North Korea’’s nuclear program, but diplomats played down prospects for________.James A. Kelly, assistant________, and Kim Yong II, North Korea’’s deputy foreign minister, met ________of formal discussions, ________on direct dialogue that began after a stormy meeting ________in which North Korea warned that it was moving quickly to ________nuclear arms.The Bush administration had insisted ________that it would only hold talks with North Korea ________because, it argued, only ________pressure would persuade North Korea to________. It got its way when North Korea dropped its insistence on ________and agreed, after extensive efforts by China, to hold unusual simultaneous negotiations with ________,________,________and ________as well as the United States.Though Bush administration officials had not ________talking privately with the North Koreans during________, the fact that Mr. Kelly and Mr. Kim met on the first day was seen as a sign of ________by the American side.
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