大工15秋《专业英语(计算机英语)》在线测试2满分答案
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大工15秋《专业英语（计算机英语）》在线测试2
一、单选题（共20 道试题，共80 分。）
1. ( ) programs are used to recover deleted or damaged(corrupted) files.
A. Data recovery
B. System call
C. System crash
D. System software
答案：A
2. ( ), software used in corporate networks (intranets and extranets) to prevent unauthorized people from accessing the network.
A. Firewall
B. Modem
C. Hypertext
D. TCP
答案：A
3. A ( ) is a highly intelligent device that supports connectivity between both like and unlike LANs,and between LANs and WANs or MANs.
A. router
B. repeater
C. switch
D. bridge
答案：A
4. ( ) is indicated by the height of a wave within a given period of time.
A. Amplitude
B. Frequency
C. Analog signals
D. Digital signals
答案：A
5. ( ), difference between the lowest and highest frequencies transmitted in a particular channel or system.
A. Amplitude
B. Bandwidth
C. Bridge
D. Network