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姚舜 《交通世界(建养机械)》2011,(7)
公路工程招投标制度是市场经济中工程建设项目管理体系的基本点和出发点,作为一种社会经济现象,招投标制度决定了社会资源的配给。招投标双方构成了这个经济游戏的主体,招标方希望选择到好的中标者 相似文献
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IntroductionBecause of the differences of crystal chemistryproperties,physical properties and surface con-ditions between ceramic and metal,the metallur-gical compatibility is very poor.It is essential tochoose suitable interlayer materials to achievethe high strengh ceramic/ metal joint.Interlayermaterials must be suitable to the propertieswhich( 1 ) would obviously reduce residual stress injoint,which may occur during cooling period be-cause of the differnet thermal expansion coeffi-cient be… 相似文献
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Control on Electron Beam Scanning Track. 总被引:5,自引:0,他引:5
In order to use electron beam as a movable welding heat source and whose energy distribution along its moving trace can be controlled, a method of electron beam scanning track and scanning mode control was put forward. Based on it, the electron beam scanning track and scanning mode can be edited at will according to actual requirements, and the energy input of each point of the scanning track can be controlled. In addition, the scanning frequency and points control, real time adjusting of the scanning track etc. were explained. This method can be used in electron beam brazing, surface modification, surface heat treatment etc. 相似文献
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姚舜 《交通世界(建养机械)》2011,(8)
在运营中的高速公路中进行养护工作,情况复杂、条件特殊,既要考虑到道路的通畅,又要顾及施工作业的安全,而且更快、更耐久完成工程。这无疑是我们道路工作者的一个挑战。下面介绍的是怎样能做到更快的识别病害,做到最高效的修补工作的技巧。 相似文献