附录4:,throughundergroundcables,frommountaintoptomountaintopovermicrowavefacilities,ontheoceanfloorinsubmarinecables,,ormodulator,canbeakeyboard,printer,cardreader,,ordemodulator,canbeappliedtoatapepunch,printer,cardpunch,puter,,binedintoatwo-waydatatransmitter--,,storesit,,,,orememories,shiftregisters,,theinput,datatransmission,,,thetransmissionmediumshouldhavelinearattenuationanddelaycharacteristics,butthisisneversoinpractice,,,,the
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