Opens, closes the CD / DVD tray:
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Computer keyboard
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Turn on, turn off the hard drive
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Closes the CD / DVD tray, Opens
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Read, Hard disk, write, room noise
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Shutting, Turning on the computer, fan noise
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Turn on, turn off the old computer
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Sound signal of a bios computer, bios
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General noise, Office work
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Repeatedly pressing a computer mouse
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Alarm, Computer interface
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Jet printer
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Photocopy (photocopy)
★★★★★