燕山大学工学硕士学位论文AbstractAll solid photonic crystal fiber has a variety of interesting properties such as easyfabrication as well as easily coupling with traditional fibers ...

成都大学学士学位设计（论文）The Influence of Family Factors on the Participation ofPrimary School Students in Longquanyi District inFootball TrainingAbstract:Abstract:In the proces...

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某三层框架结构厂房设计全套图纸及计算书2500平米左右/建筑图.dwg某三层框架结构厂房设计全套图纸及计算书2500平米左右/结构图完.DWG某三层框架结构厂房设计全套图纸及计算书2500平米左右/计算...

本科论文AbstractWith the acceleration of urbanization and the increase of urban population,thecontradiction between urban development and urban infrastructure is prominent.Trafficc...

本科论文摘要伴随着祖国机加工能力的崛起，数控提升折弯机是利用标准的模具，将金属板进行加工，折弯机的坐标轴己由单轴发展到12轴。本论文的研究目的意义为研究金方圆数控提升折弯机中的丝杠调...

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《赣南特色农产品物流发展研究》是在指导教师的指导下，独立开展研究取得的成果，文中引用他人的观点和材...

4.衰减.10图3-7声压在不同距离下的衰减特性105.声压特性10图3-8超声波传感器的声压图，.116.灵敏度特性图3-9超声波传感器灵敏度示意图117.辐射特性….113.3.5测距分析..12图3-11探测距离原理图....

AbstractThe automatic measuring of distance is mainly used in measuring the distance of CarBacking reminding,construction sites,industrial site,etc.The application of ultrasonic te...

AbstractThe safety of young children affects not only the daily work and happy life of thefamily,but also the harmony and stability of the society.In order to ensure thesafety of y...