Hard disk, read, write, room noise:
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Shutting, Turning on the computer, fan noise
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Matrix printer
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Closes the CD / DVD tray, Opens
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Computer noise, Communication room
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Computer mouse click
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Turn on, turn off the old computer
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Turn off the hard drive, Turn on
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Photocopy (photocopy)
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General noise, Office work
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Removed, The USB flash drive is inserted
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Computer simulated laser
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Computer interface, signal read information
★★★★★