题目内容

( )controls and manages the system’s hardware and software resources, thus enabling a user to use his computer conveniently and efficiently. ( )

A. Translator software
B. Operating system software
C. Application software
D. A text editing or word processing program

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A. NSF工
B. INTERNET的商业化
C. ARPANET
D. INTERNET的国际化

A. OSI
B. TCP
C. UDP
D. IP

A. 172.192.42.1-172.192.42.254
B. 172.16.42.1-172.16.42.254
C. 172.10.42.1-172.10.42.254
D. 172.168.42.1-172.168.42.254

A. biz
B. name
C. info
D. coop