Matrix printer:
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Computer interface, alarm
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Disc read, Opens, closes the CD / DVD tray
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Laser printer
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The USB flash drive is inserted, removed
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General noise, Office work
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Computer keyboard
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Double click computer mouse
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Read the, Insert the disk into the drive
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Computer interface, signals
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Turn off the hard drive, Turn on
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Read, room noise, write, Hard disk
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Floppy disk reading
★★★★★