Opening, closing the laptop cover:
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Computer interface, signals
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Closes the CD / DVD tray, Opens, disc read
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Turn off the old computer, Turn on
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Office work, general noise
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Photocopy (photocopy)
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Pressing a keypad, input error sound
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Read, write, room noise, Hard disk
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Repeatedly pressing a computer mouse
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Turning on the computer, fan noise, shutting
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Read the, Insert the disk into the drive
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Disc read, CD / DVD drive
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Interference, Modem connection, signal
★★★★★