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问题 单项选择题

发生故障短时间无法修复或暂时停机超过一个清机周期的ATM机，必须（）清机将钞箱收回，因故障无法清机的也要将钞箱取回

A.次日

B.3日内

C.当天

D.一周内

答案

参考答案：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 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.

3（）

A．collision

B．congestion

C．drop

D．delay
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单项选择题

与呼吸微弱、脉动异常等病症关系最为密切的是（）

A.元气

B.宗气

C.营气

D.卫气
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