该包内含有39个关于超声波测距仪设计文档，如（车载超声测距仪的研制，基于CAN总线通信的车用超声波测距仪设计，高准确度超声波测距仪的研制等等）有caj和kdh两种格式，使用CAJVIEWER7.0即可打开！-The pack contains 39 design documents on the ultrasonic range finder, such as (car ultrasonic range finder of the research and development, based