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问题 单项选择题

6，7，5，8，4，9，______。

A．5
B．10
C．3
D．4

答案

参考答案：C

解析： 相邻两项加和，可得13、12、13、12、13、(12)，为周期数列。

单项选择题

塞来昔布属于（）类药物

A、COX－１选择性抑制剂

B、COX－１选择性激动剂

C、COX－２选择性抑制剂

D、COX－２选择性激动剂
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单项选择题

The metric assigned to each network depends on the type of protocol. Some simple protocol, like RIP, treats each network as equals. The（1）of passing through each network is the same; it is one（2）count. So if a packet passes through 10 network to reach the destination, the total cost is 10 hop counts. Other protocols, such as OSPF, allow the administrator to assign a cost for passing through a network based on the type of service required.A（3）through a network can have different costs (metrics). For example, if maximum（4）is the desired type of service, a satellite link has a lower metric than a fiber-optic line. On the other hand, if minimum（5）is the desired type of service, a fiber-optic line has a lower metric than a satellite line. OSPF allow each router to have several routing table based on the required type of service.

4（）

A．1atency

B．throughput

C．utilization

D．jitter
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