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问题 单项选择题

狂犬病是

A．狂犬病是由狂犬病毒侵犯中枢神经系统引起的急性人兽共患传染病，因临床表现以惧怕水为特征，又称“恐水病”；因多为被狗抓咬伤后发病，故我国民间也称“疯犬病”或“疯狗病”

B．狂犬病是由狂犬病毒感染所引起的以损害呼吸系统为主的传染病

C．狂犬病是由狂犬病毒引起的急性传染病，主要感染家畜、宠物、野生动物，基本不会感染人

D．狂犬病病死率为50％以上

E．狂犬病发病后只要经积极治疗就可显著降低病死率

答案

参考答案：A

单项选择题

Networks can be interconnected by different devices．In the physical layer，networks can be connected by (66) or Hubs, which just move the bits from one network to an identical net-work. One layer up we find bridgas and swiehes, which operate at data link layer. They can accept (67) , examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer, we have routers that can connect two netwoks. If two networks have (68) network layer, the router may be able to translate between the packet formats. In the transport layer we find transport gateway, which can interface between the two transport connections. Finally, in the application layer, application gateways translate message
(69) . As an example, gateways between Internet e-mail and X.400 e-mail must (70) the e-mail message and change various header fields.

A．frames

B．bytes

C．packages

D．cells
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单项选择题 A1型题

休克时发生急性肾衰竭诊断的依据是（）

A.少尿

B.氮质血症

C.多尿

D.肾性高血压

E.肾性贫血
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