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 electronic circuit breaker直流电子脱扣器DC electron stream resistance电子束直流电阻DCT-based compressed domain离散余弦变换压缩域DC potential difference method直流电位差法DC adjustable - speed device直流调速系统DC I direct cylinder injection直接喷入汽缸DC rectifier fed track circuit整流器馈电的直流轨道电路DC remote reserve power supply直流远供DCLU Digital Carrier Line Unit数字载波线路单元DC magnetron sputtering system直流磁控溅射