铜陵学院毕业设计AbstractUltrasonic technology can quickly and accurately measure the thickness of metal andnon-metal materials and pollution-free,so it is very suitable for nondest...

南京工业职业技术学院凯美瑞轿车空调故障分析及维修工艺凯美瑞轿车空调故障分析和维修工艺摘要汽车空调系统是实现对车厢内空气进行制冷、加热、换气和空气净化的装置。它可以为乘车人员提供舒适...

无锡职业技术学院毕业设计（论文）说明书AbstractTheposture,charm,colorandfragranceofflowersmakeflowersbecomeoneofthemostattractivetouristpurposesforpeople.Flowertourismisnotonlyagree...

130例，占52%，女性120例，占48%，年龄52-78岁，平均64.7岁：对照组中男性123例，占49.2%，女性127例，占50.8%，年龄53-77岁，平均58.9岁。两组患者在性别、年龄、病情严重程度等一般情况无统计...

【6层】6190平米六层框架宾馆（计算书、部分建筑结构图纸）/剖面图x.dwg【6层】6190平米六层框架宾馆（计算书、部分建筑结构图纸）/基础图x.dwg【6层】6190平米六层框架宾馆（计算书、部分建筑...

AbstractIn order to improve the safety and convenience of people's access,reduce the complexity of family access,and realize the safety monitoring ofindoor and outdoor access and t...

江西红壤丘陵区的弃土堆置体六大研究区弃土堆置体坡面D10mm的块石和土壤结构体重力分选作用明显，小粒石与固结土块、粗粒土、中粒土、细粒土在不同坡位的含量数据变化较小且无明显规律：因此在...

AbstractBidding is in goods,projects and services procurement,tendering throughannounced in advance procurement and requirements,to attract a large number ofbidders in accordance w...

第1页 / 共10页第2页 / 共10页第3页 / 共10页第4页 / 共10页第5页 / 共10页第6页 / 共10页第7页 / 共10页第8页 / 共10页试读已结束，还剩2页，您可下载完整版后进行离线阅读

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...