未知题型
are privately-owned networks within a single building or campus of up to a few kilometers in sizE.
A.PSTN
B.WAN
C.LAN
D.MAN
- A.A.PSTN
B.WAN
C.LAN
【参考答案】
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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