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AbstractWith the development of power electronics,PWM inverters are getting more widelyused,such as PWM drives,UPS etc.However,high frequency switching of powersemiconductor device...

重庆大学硕士学位论文ABSTRACTWith economic boom of China,especially the rapid development of high-speed railindustry,various power electronic devices have been applied more and more...

燕山大学工学硕士学位论文AbstractWith more and more attention on sustainable development and environmentalpollution,distributed generation,wind power and solar as representative,has...

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西安航空学院本科毕业设计（论文）ABSTRACTThe modern world with the increase of family use of fire and electricity consumption,residential area and personnel flow of local fire frequ...

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目录一、引言.……(一)研究背景1(二)研究对象(三)研究意义1二、相关概念.2(一)广告及城市轨道交通广告媒体的概念...................21.广告的概念22.城市轨道交通广告媒体的概念.................

北京理工大学珠海学院2020届本科生毕业论文诚信承诺书本人郑重承诺：我所呈交的毕业论文《基于BIM的全生命周期项目信息管理系统》是在指导教师的指导下，独立开展研究取得的成果，文中引用他人...

AbstractFor a long time,games and learning seem to be the opposite relationship,in many people's cognition,games are only entertainment tools,is used toamuse things,will not learn ...