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单词 program failure alarm
释义 program failure alarm
[`prō·grǝm `fāl·yǝr ǝ´lärm]
COMMUNICATIONS
Signal-operated radio or television vacuum-tube relay that gives a visual and aural alarm when the program fails on the line being monitored; a time delay is provided to prevent the relay from operating and giving a false alarm during station identification periods or other short periods of silence in program continuity.
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