Jet printer:
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Jet printer
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Communication room, computer noise
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Opening, closing the laptop cover
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Computer keyboard
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The USB flash drive is inserted, removed
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Photocopy (photocopy)
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Manual copy machine
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Alarm, Computer interface
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Hard disk, write, room noise, read
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Turn off the old monitor, Turn on
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Shutting, fan noise, Turning on the laptop
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Computer interface, signal read information
★★★★★