2. 计算机
  3. (74)was designed many years ago，with a goal in mind：transmitting the human voice in a more-or-less recognizable form．

(74)was designed many years ago，with a goal in mind：transmitting the human voice in a more-or-less recognizable form．

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问题 (74)was designed many years ago，with a goal in mind：transmitting the human voice in a more-or-less recognizable form．
选项 A、DWDM
B、PSTN
C、internet
D、WLAN
答案B
解析 PSTN设计了多年，它的日的是以一个或多或少的可辨别的格式来传送人类的语音。
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