ads abbr. area, date, subject 地区; air defense system 防空系统; advance data system 高级数据系统; accessory drive system 附属驱动系统 n. 广告( ad的名词复数 ); (administration) 管理; (advance) 预付; (addendum) 附录
adu abbr. acceleration-deceleration unit 加速度-减速度单位; accessory dwelling unit 附属住所单位; accumulation-distribution unit 积累-分发单位; analog-to-digi tal (conversion) unit 模拟-数字(转换)单元