Matrix printer:
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Photocopy (photocopy)
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Computer interface, signal read information
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Repeatedly pressing a computer mouse
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Laser printer
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The USB flash drive is inserted, removed
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Turn on, turn off the hard drive
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Turn off the old computer, Turn on
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Shutting, Turning on the laptop, fan noise
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Matrix printer
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Turn off the old monitor, Turn on
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Computer simulated laser
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Sound signal of a bios computer, bios
★★★★★