Digital data can also be represented by (71) signals by use of a modem．The modem converts a seriesof binary voltage (72) into

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问题 Digital data can also be represented by (71) signals by use of a modem．The modem converts a seriesof binary voltage (72) into an analog signal by encoding the digital data onto a carrier frequency．The resuming signal occupies a certain spectrum of (73) centered about the carrier and may be propagated across a medium suitable for that carrier．The most common modems represent digital data in the voice (74) and hence allow those data tO be propagated over ordinary voice-grade (75) lines．At the other end of the line，another modem demodulates the signal to recover the original data．
(73)

选项 A、medium
B、frequency
C、modem
D、carrier

答案B

解析

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