【Abstract】 Recently there is a widespread concern about university students’ hopes and fears for the future especiall......

导读：听说过人力驱动的主题公园吗？在意大利威尼斯，就有这么一座主题公园，公园里每一项设施的运转都是通过人力来驱动的。　　Some of ......

The high accuracy DC power supply has a wide application in the accelerator field. A majority of power supplies applied ......