Photocopy (photocopy):
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Laser printer
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Repeatedly pressing a computer mouse
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Write, Hard disk, room noise, read
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Matrix printer
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Turn off the hard drive, Turn on
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Input error sound, Pressing a keypad
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Communication room, computer noise
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Double click computer mouse
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Manual copy machine
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Computer interface, alarm
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Fan noise, Turning on the laptop, shutting
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Signals, Computer interface
★★★★★