Opening, closing the laptop cover:
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Signals, Computer interface
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Matrix printer
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Computer simulated laser
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Turn on, turn off the hard drive
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Hard disk, read, room noise, write
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Computer keyboard
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Double click computer mouse
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Read the, Insert the disk into the drive
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Jet printer
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Repeatedly pressing a computer mouse
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The USB flash drive is inserted, removed
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Turn off the old computer, Turn on
★★★★★