Modem connection, signal, interference:
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Turn off the hard drive, Turn on
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Repeatedly pressing a computer mouse
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Turn on, turn off the old monitor
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Computer mouse click
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Shutting, Turning on the computer, fan noise
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Computer mouse movement
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Closing the laptop cover, Opening
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Turn on, turn off the old computer
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Photocopy (photocopy)
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Removed, The USB flash drive is inserted
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Matrix printer
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Jet printer
★★★★★