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 servo-motor直流伺服电机DC neutral relay直流无极继电器DC micro-motor微型直流电机dcpsk modulation差分相干相移键控调制DC speed control直流调速DC-AC inverter逆变器DC remote supply直流远供DC servo control直流伺服控制DC bias networks直流偏置网络DC control panel直流控制板