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English thesaurus
Carrier Detect
abbr.	CD (EIA RS-232-C; properly DCD (q.v.))
abbr., file.ext.	CD
IT, abbr.	CD (MODEM, RS-232); CD (properly DCD (q.v.), EIA RS-232-C)

carrier: 5 phrases in 3 subjects

Electronics	2
Magnetics	1
Power system protection	2