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问题 多项选择题

对附有检疫证明、检疫标志的动物、动物产品重复检疫的，由本级人民政府兽医主管部门（），对直接负责的主管人员及其他直接责任人员依法给予处分。

A、责令改正

B、通报批评

C、追究责任

D、给予警告

答案

参考答案：A, B

探究题

“孑孓”是蚊子的幼虫，适于生活在水中。几个同学对“孑孓 的生活是否需要空气”的问题争论不休：有的认为需要空气，有的认为不需要空气。请你根据下图设计一个实验探究该问题。

提出问题：__________。 

作出假设：____________。 

实验设计：______________________。

预期的实验结果：甲一段时间后孑孓衰弱死亡；乙一段时间后孑孓正常生活。试分析出现该结果的原因：___________________。

得出的结论：__________________。

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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 (11) 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 (12) ,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 networks. If two networks have (13) network layer, the router may be able to translate between the 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 (14) . As an example, gateways between Internet e-mail and X.400 e-mail must (15) the e-mail message and change various header fields.

A. specialB. dependent C. similar D. dissimilar
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