1)case fractions,piece fraction,分数用字2)versatile digital analyser,通用数字分析器3)Digital Multiplexer-Demultiplexer,数字复接,分接器数字复用器-数字分解器4)synchronous digital hierarchy over wawelength division multiplex,同步数字序列/波分复用5)"RGIS" analysis of digital mine,数字矿山"RGIS"应用分析6)digital demodulation of TDM,时分复用数字化解调
