Turning on the computer, fan noise, shutting down:
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Manual copy machine
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Insert the disk into the drive, read the
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Opening, closing the laptop cover
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Removed, The USB flash drive is inserted
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Signal read information, Computer interface
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Input error sound, Pressing a keypad
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Computer keyboard
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Laser printer
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Floppy disk reading
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Turn on, turn off the old monitor
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Turn off the hard drive, Turn on
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Computer interface, signals
★★★★★