2. 计算机
  3. (71) are privately-owned networks within a single building or campus of up to a few kilometers in size.

(71) are privately-owned networks within a single building or campus of up to a few kilometers in size.

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问题 (71) are privately-owned networks within a single building or campus of up to a few kilometers in size.
选项 A、PSTN
B、WAN
C、LAN
D、MAN
答案C
解析 参考译文：局域网是一个私有网络，一般架设在—栋楼或者是区域大小为数千米的校园内。
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