单项选择题

Software is divided into two categories，system software and application software．Please choose one which is differ from other three

A．WindOws 98
B．Word 2000
C．C++compiler
D．FoxBase DBMS
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单项选择题
Which of the following commands is not for communication among users
A．mail
B．write
C．telnet
D．nice
单项选择题
与传统Ethernet采用相同的介质访问控制方法与帧结构，而只是将它的每个比特的发送时间降低到10ns，这种局域网叫做
A．ATM
B．Fast Ethernet
C．Gigabit Ethernet
D．Switched Ethernet
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