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單項選擇題下列有關廣域網的敘述中，正確的是（）。

A.廣域網必須使用撥號接入
B.廣域網必須使用專用的物理通信線路
C.廣域網必須進行路由選擇
D.廣域網都按廣播方式進行數據通信

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1.單項選擇題某項目的主要約束是質量，為了不讓該項目的項目團隊感覺時間過于緊張，項目經理在估算項目活動歷時的時候應采用（），以避免進度風險。

A.專家判斷
B.定量歷時估算
C.設置備用時間
D.類比估算

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2.單項選擇題以下不具有"完成-開始"關系的兩個活動是（）。

A.系統(tǒng)設計，設計評審
B.系統(tǒng)分析，需求評審
C.需求評審，周例會
D.確定項目范圍，制定WBS

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3.單項選擇題某軟件公司欲開發(fā)一個圖像處理系統(tǒng)，在項目初期開發(fā)人員對需求并不確定的情況下，采用（）方法比較合適。

A.瀑布式
B.快速原型
C.協同開發(fā)
D.形式化

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4.單項選擇題Many of the activities performed during the preliminary investigation are still being conducted in（1）,but in much greater depth than before. During this phase, the analyst must become fully aware of the（2）and must develop enough knowledge about the（3）and the existing systems to enable an effective solution to be proposed and implemented. Besides the（4）for process and data of current system, the deliverable from this phase also includes the（5）for the proposed system.

A. hardware and software specification
B. system performance specification
C. formal requirements definition
D. general problem statement

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5.單項選擇題Many of the activities performed during the preliminary investigation are still being conducted in（1）,but in much greater depth than before. During this phase, the analyst must become fully aware of the（2）and must develop enough knowledge about the（3）and the existing systems to enable an effective solution to be proposed and implemented. Besides the（4）for process and data of current system, the deliverable from this phase also includes the（5）for the proposed system.

A.logical models
B.physical models
C.design models
D.implementation models

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