DCCn.更改设计委员会(设计概念的改变)dcabbr.直流(=direct current)abbr.哥伦比亚特区(=District of Columbia)DC-brushless centrifugal fan无刷直流离心式风机DC-link voltage pumping-up直流侧电压泵升DC electroluminescent phosphor直流电致发光荧光粉DC long-distance power supply直流远供dc electrical quantities output直流输出DC filtered cathodic vacuum arc磁过滤真空阴极弧DC moving coil round instrument直流动圈式圆形电表DC traction power supply system直流牵引供电系统DC superposition characteristic直流叠加特性DC and AC hybridde-excitation交直流混合灭磁