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问题 单项选择题 A3型题

猪场，1～2月龄仔猪278头，近日个别表现顽固性下痢；跛行，姿势异常，运动障碍；心率加快、节律不齐，功能不全，可视黏膜苍白；剖检3头心肌变性，似熟肉，灰黄色、黄白色的点状、条状，桑葚心，心内膜、外膜下有黄白色或灰白条纹。血检最可能出现（）

A.白细胞总数增多

B.GSH-Px活性升高

C.白细胞总数正常

D.GSH-Px活性降低

E.红细胞总数减少

答案

参考答案：D

判断题

个人因公外出，携带秘密载体应当采取严格的保密措施。
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单项选择题

Networks can be interconnected by different devices in the physical layer networks can be connected by (71) or hubs．which just move the bits from one network to an identical network．One layer up we find bridges and switches which operate at data link layer．They can accept (72) ，examine the MAC address and forward the frames to a different network while doing minor protocol translation in the process in me network layer，we have routers that can connect two networks，If two networks have (73) network layer，the router may be able to translate betweenthe packer formats．In the transport layer we find transport gateway，which can interface between two transport connections Finally，in the application layer，application gateways translate message (74) ．As an example，gateways between Internet e-mail and X，400 e-mail must (75) thee-mail message and change various header fields．

A．analyze

B．parse

C．delete

D．create
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