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

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．
     (74)
选项 A、wave
B、frequency
C、code
D、spectrum
答案D
解析
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