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问题 选择题

X是一种无色气体，与炽热炭粉反应，只生成一种无色气体Y，Y与氧化铁在加热条件下发生反应，又生成X，则X可能是[ ]

A．O2

B．H2

C．CO

D．CO2

答案

答案：D

单项选择题

男，45岁。车祸伤3小时，头痛、呕吐。CT发现颅内积气，诊断考虑（）

A.颅内动脉瘤破裂

B.脑挫裂伤

C.脑震荡

D.弥漫性轴索损伤

E.颅底骨折
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单项选择题

(71) is used to ensure the confidentiality, integrity and authenticity of the two end points in the private network. (72) , 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 (73) to secure data traffic can automatically authenticate devices by using (74) , 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 (75) 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.

A．characteristics
B．associated links
C．digital certificates
D．attributes
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