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问题 问答题

某公司内部组建了100Base-Tx局域网，其结构图如图6所示。请根据网络结构图回答以下有关问题。

为保护内部局域网用户，常用的安全防护系统有哪些

答案

参考答案：

防火墙系统、网络防病毒系统、入侵检测系统、漏洞扫描系统

单项选择题

The human nose is an underrated tool. Humans are often thought to be insensitive smellers compared with animals, (51) this is largely because, unlike animals, we stand upright. This means that our noses are (52) to perceiving those smells which float through the air, missing the majority of smells which stick to surfaces. In fact, (53) , we are extremely sensitive to smells, even if we do not generally realize it. Our noses are capable of (54) human smells when these are diluted to far below one part in one million.

Strangely, some people find that they can smell one type of flower but not another, (55) others are sensitive to the smells of both flowers. This may be because some people do not have the genes necessary to generate (56) smell receptors in the nose. These receptors are the cells which sense smells and send (57) to the brain. However, it has been found that even people insensitive to a certain smell at first can suddenly become sensitive to it when (58) to it often enough.

The explanation for insensitivity to smell seems to be that the brain finds it (59) to keep all smell receptors working all the time but can (60) new receptors if necessary.

54().

A.distinguishing 

B.discovering 

C.determining 

D.detecting
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单项选择题

某施工企业对建设行政主管部门的行政处罚不服，向人民法院提起了行政诉讼。关于本案中的举证责任，下列说法正确的是( )。

A．举证责任的分配原则是“谁主张，谁举证”

B．建设行政主管部门在诉讼过程中不得自行取证

C．施工企业对没有违法的事实负有举证责任

D．作出该行政处罚的依据应当由施工企业提供
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