Defense of Satellites防御的卫星 Down Syndrome Association of Toronto唐氏症协会于多伦多 Defense Satellite国防卫星 Defensive Satellite防御卫星 Data Self-Assessment Toolkit自我评估数据工具 Developmental Submarine Analytical Test-Bed分析试验台发展潜艇 Diving Science and Technology (subsidiary of PADI)潜水科技(今天的子公司) Digital Supervisory Audio Tone数字监控音频信号 DII (Defense Information Infrastructure) Satellite Terminal信息基础设施)(防守DII卫星终端 Digital Storage Architecture for Tape数字存储架构的磁带