In most wide area networks, the communication subnet consists of two distinct components：transmission lines and

A．networts

B．switching elements

C．computers

D．data terminal equipment

[单选题]A． local area network(LAN)is the communication of a number of computers by(68)connecting to each one in a single location, usually a single floor of a building or all the computers in a small company.A．lineB．cableC．copperD．copper cash

[单选题]A． local area network(LAN)is the communication of a number of computers by(66)connecting to each one in a single location, usually a single floor of a building or all the computers in a small company.A．lineB．cableC．copperD．copper cash

[名词解释] 广域网WAN（Wide Area Net）

[单选题]Which area is the most commodities shipped in water transport?（）A . In international deep seaB . In lakesC . In river and canalsD . Coastal ocean

[单选题]（）Which area is the most commodity shipped in water transport?A . In international deep seaB . In lakesC . In river and canalsD . Coastal ocean

[单选题]( )is an error detection code that most data communication networks use.A.C

[单选题]The Midwest is America′s most important ( ) area.A.agriculturalB.industrial

[单选题]Paper is one of the most important products ever invented by man. Wide spre

[单选题]Paper is one of the most important products ever invented by man. Wide spre

[单选题]Paper is one of the most important products ever invented by man. Wide spre