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问题 选择题

2007年某市完成国内生产总值（GDP）达3466.53亿元，用四舍五入法取近似值，保留3个有效数字并用科学记数法表示为（　　）

A．3.47×103亿元

B．3.47×104亿元

C．3.467×103亿元

D．3.467×104亿元

答案

3 466.53=3.46653×103亿≈3.47×103亿元．

故选A．

问答题

密陀僧
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单项选择题

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.

In low-speed network, it is usually adequate to wait for congestion to occur and then react to it by telling the source of packets to slow down. In high-speed networks, this approach often works poorly, because in the (1) between sending the notification and notification arriving at the source, thousands of additional (2) may arrive. In ATM network, a major tool for preventing (3) is (4) control. When a host wants a new virtual (5) , it must describe the traffic to be offered and the service expected.

2（）

A．packets

B．cells

C．message

D．files
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