Photocopy (photocopy):
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Read, Hard disk, write, room noise
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Read the, Insert the disk into the drive
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Computer keyboard
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Franking machine
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Signal read information, Computer interface
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Turn off the hard drive, Turn on
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Sound signal of a bios computer, bios
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The USB flash drive is inserted, removed
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Laser printer
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Office work, environmental sounds, typewriter
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Shutting, Turning on the computer, fan noise
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Computer interface, signals
★★★★★