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问题 判断题

自动气象站故障造成数据缺测，值班员在1小时之内发现并报告，不算个人错情，但在自动气象站出现故障后72小时内不能恢复正常工作时，要把错情统计给站（组）。（）

答案

参考答案：对

单项选择题

鉴别急性炎症性脱髓鞘性多发性神经病和周期性瘫痪(常见类型)最主要的是

A．运动障碍

B．感觉障碍

C．血钠改变

D．血钾改变

E．脑脊液改变
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单项选择题

The network layer provides services to the transport layer. It can be based on either___20___. In both cases, its main job is ___21___ packets from the source to the destination.

In network layer, subnets can easily become congested, ncreasing the delay and ___22___ for packets. Network designers attempt to avoid congestion by proper design. Techniques include___23___ policy, caching, flow control, and more.

The next step beyond just dealing with congestion is to actually try to achieve a promised quality of service. The methods that can be used for this include buffering at the client, traffic shaping, resource___24___, and admission control. Approaches that have been designed for good quality of service include integrated services (including RSVP), differentiated services, and MPLS.

20（）

A. virtual circuits or datagrams

B. TCP or UDP

C. TCP or IP

D. IP or ARP
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