A．(72) is a data communication system that allows a number of independent devices to communications directly with each other in a limited geographic area.

A．LAN

B．WAN

C．Internet

D．Ethernet

[单选题]In a data communication system, which transport media can be described as following: Has two classes: single mode and multiple mode; with higher transmit rate; with the best reliabilityA．radio channelB．fiber optic cableC．twisted-pair cableD．coaxial c

[问答题]数据通信（Data Communication）

[单选题]The(72)is a system for linking hypertext documents Originally, each document was a page written in(73)with hyperlinks to other documents．Nowadays，XML is gradually starting to take over from(73)．A．WebB．E-mailC．DNSD．FTP

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

[单选题]On a(72) memory system, the logical memory space available to the program is totally independent of the physical memory space.A．cacheB．EPROMC．virtualD．SRAM

[单选题]An Embedded System is a (72)designed for specific control functions within a larger system.(72) A． computerB． programC．computer systemD．tool

[单选题]The following data pertain to the total output in units and average selling

[单选题]Thebasic concept of a data (72) is the difference between data and information.(72) A．warehouseB．storageC．baseD．service

[单选题]The basic concept of a data(72)is the difference between data and information.A．warehouseB．storageC．baseD．service

[单选题]In computer science ,a data (72) is a way of storing data in acomputer so that it can be used efficiently.(72)A.recordB．fileC．structureD．pool