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單項(xiàng)選擇題下列有關(guān)廣域網(wǎng)的敘述中，正確的是（）。

A.廣域網(wǎng)必須使用撥號(hào)接入
B.廣域網(wǎng)必須使用專用的物理通信線路
C.廣域網(wǎng)必須進(jìn)行路由選擇
D.廣域網(wǎng)都按廣播方式進(jìn)行數(shù)據(jù)通信

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你可能感興趣的試題

1.單項(xiàng)選擇題某項(xiàng)目的主要約束是質(zhì)量，為了不讓該項(xiàng)目的項(xiàng)目團(tuán)隊(duì)感覺(jué)時(shí)間過(guò)于緊張，項(xiàng)目經(jīng)理在估算項(xiàng)目活動(dòng)歷時(shí)的時(shí)候應(yīng)采用（），以避免進(jìn)度風(fēng)險(xiǎn)。

A.專家判斷
B.定量歷時(shí)估算
C.設(shè)置備用時(shí)間
D.類比估算

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2.單項(xiàng)選擇題以下不具有"完成-開(kāi)始"關(guān)系的兩個(gè)活動(dòng)是（）。

A.系統(tǒng)設(shè)計(jì)，設(shè)計(jì)評(píng)審
B.系統(tǒng)分析，需求評(píng)審
C.需求評(píng)審，周例會(huì)
D.確定項(xiàng)目范圍，制定WBS

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3.單項(xiàng)選擇題某軟件公司欲開(kāi)發(fā)一個(gè)圖像處理系統(tǒng)，在項(xiàng)目初期開(kāi)發(fā)人員對(duì)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(xié)同開(kāi)發(fā)
D.形式化

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4.單項(xiàng)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(xiàng)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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