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问题 选择题

— Hi, Terry, can I use your computer for a while this afternoon? 

— Sorry. _____. [ ]

A. It's repaired

B. It has been repaired

C. It's being repaired

D. It had been repaired

答案

答案：C

单项选择题

In low-speed network，it is usually adequate to wait for congestion to occur and then react to it bytelling the source of packets to slow down．In high-speed networks，this approach often works poorly，because in the (71) between sending the notification and notification arriving at the source，thousands of additional (72) may arrive．In ATM network，a major tool for preventing (73) is (74) control．When a host wants a new virtual (75) ，it must describe the traffic to be offeredand the service expected．

（74）处填（）。

A．flow

B．admission

C．traffic

D．time
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问答题 简答题

普雷斯曼(R.S.Pressman)对软件开发工作量分配提出了一个什么原则？该原则对信息系统开发的各阶段工作量分配具有什么借鉴意义？
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