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【单选题】
以下关于广域网技术的叙述中，错误的是_______。A.
广域网技术研究的重点是核心交换技术
B.
广域网技术的典型技术包括公共交换网PSTN，综合业务数字网ISDN，数字数据网DDN，X.25分交 换网，X.25分组交换网，帧中继网，异步传输模式ATM网，光以太网等
C.
帧中继网是基于点-点连接的窄带公共数据网(正确：数字数据网DDN是……)
D.
异步传输模式ATM网的发展空间已经比较小
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举一反三
【单选题】Which of the following would be the most appropriate title for the text?
A.
The Earliest Memories
B.
Earliest Memories, Good or Bad
C.
The Power of Earliest Memories
D.
How to Recall Earliest Memories Better
【单选题】典型慢性肺源性心脏病应具备哪一项X线表现:
A.
肺动脉高压、右室大
B.
肺淤血、右室大、左房大
C.
肺充血、左、右室大
D.
肺少血、右室大、主动脉宽
E.
肺水肿，心脏普遍大
【单选题】The earliest method of delivering telecommunications is the ______．
A.
telegraph
B.
telephone
C.
e-mail
D.
letter
【单选题】Which is the best title of this passage?
A.
The Earliest People in North America.
B.
The Earliest Immigrants to North America.
C.
The People of the United States.
D.
Europeans Were the Earliest People Coming to the North America.
【单选题】Which is the best title of this passage?
A.
The Earliest People in North America．
B.
The Earliest Immigrants to North America．
C.
The People of the United States．
D.
Europeans were the Earliest People Coming to the North America．
【简答题】红移现象
【简答题】红移现象
【简答题】Where and when was the earliest daily newspaper started? It was started in __________in__________.
【简答题】(3分)红移现象(red transition)
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