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问题 单项选择题

机体内环境的稳态是指

A．细胞内液理化性质保持不变
B．细胞内液化学成分相对恒定
C．细胞外液理化性质保持不变
D．细胞外液化学成分相对恒定
E．细胞外液理化性质相对恒定

答案

参考答案：E

单项选择题

电梯在运行中的要求有工作可靠、便于维修、噪音低、振动小、平层准确，还应做到（）.

A.运行稳定

B.性能可靠

C.安全舒适

D.结构合理
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单项选择题

___57___ is used to ensure the confidentiality, integrity and authenticity of the two end points in the private network. ___58___, 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 also handles the exchange of session keys used for that one transaction.

Networks that use ___59___ to secure data traffic can automatically authenticate devices by using by using ___60___, which verify the identities of the two users who are sending information back and forth. IPSec can be ideal way to secure data in large networks that require secure connections among many devices.

Users deploying IPSec can ___61___ their network infrastructure without affecting the applications on individual computer. The protocol suite is available as a software-only upgrade to the network infrastructure. This alows security to be implemented without costly changes to each computer. Most important, IPSec allows interoperability among different network devices, PCs and other computing systems.

61（）

A. secure

B. relation

C. script

D. strict
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