Manual copy machine:
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Computer simulated laser
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Pressing a keypad, input error sound
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Computer interface, signal read information
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Computer mouse movement
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Bios, Sound signal of a bios computer
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Photocopy (photocopy)
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Office work, general noise
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Turn on, turn off the old computer
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Removed, The USB flash drive is inserted
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Turn off the hard drive, Turn on
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Matrix printer
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Room noise, Hard disk, read, write
★★★★★