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问题 选择题

肺的功能单位是（　　）

A．呼吸性的支气管

B．细支气管

C．肺泡

D．肺泡管

答案

肺的功能是进行气体交换，而肺进行气体交换的场所是肺泡，因此肺泡是肺的功能单位，同时，从肺的结构来看，肺泡又是肺的结构单位，如图所示：

故选C

选择题

设a=log0.56.7，b=log24.3，c=log25.6，则a，b，c的大小关系为（　　）

A．b＜c＜a

B．a＜c＜b

C．a＜b＜c

D．c＜b＜a
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单项选择题

(1) is used to ensure the confidentiality,integrity and authenticity of the two end points in the private network． (2) ，an application—layer protocol，authenticates each peer in an IPSec transaction．IKE negotiates security policy，determining which algorithm may be used to set up the tunnel．it alsohandles the exchange of session keys used for that one transaction．

Networks that use (3) to secure data traffic can automatically authenticate devices by using (4) ，which verify the identities of the two users who are sending information back and forth．IPSeccan be ideal way to secure data in large networks that require secure connections among many devices．

Users deploying IPSec can (5) their network infrastructure without affecting the applications on individual computer．The protocol suite is available as a software-only upgrade to the networkinfrastructure．This alows security to be implemented without costly changes to each computer．Mostimportant，IPSec allows interoperability among different network devices，PCs and other computingsystems．

4（）

A．characteristics

B．associated links

C．digital certificates

D．attributes
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