DCLn.直接藕合逻辑线路dcabbr.直流(=direct current)abbr.哥伦比亚特区(=District of Columbia)DC working point直流工作点DC bus capacitor直流侧电容DC signal source直流信号源DC timing system直流调速系统DC motor control直流电动机控制dcvelopment trend发展趋势dctecting element检测端DC voltage source直流稳压电源DC power resource直流电源DC-side voltage直流侧电压