OS computer abbreviation usually means ?
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1) A given signal's second harmonic is twice the given signal's __________ frequency...?
2) Sometimes computers and cache registers in a foodmart are connected to a UPS system. What does UPS mean?
3) Compact discs, (according to the original CD specifications) hold how many minutes of music?
4) What do we call a collection of two or more computers that are located within a limited distance of each other and that are connected to each other directly or indirectly?
5) '.TXT' extension refers usually to what kind of file?