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问题 单项选择题

根据TSGZF001-2006《安全阀安全技术监察规程》的规定：制造时对什么样的安全阀要进行气密性试验（）

A、每一只安全阀

B、易燃易爆介质的安全阀

C、封闭式安全阀

D、微启式安全阀

答案

参考答案：C

单项选择题

(66) is used to ensure the confidentiality, integrity and authenticity of the two end points in the private network. (67) , 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 (68) to secure data traffic can automatically authenticate devices by using (69) , 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 (70) 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.

A．characteristics

B．associated links

C．digital certificates

D．attributes
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问答题

读图，回答下列问题．

（1）影响我国的夏季风主要是来自______洋和______洋的偏______（风向），受其影响，我国夏季的气候特点是______．

（2）受夏季风影响明显是______--阴山--賀兰山以______（东或西）的地区，称为______区．

（3）受季风的影响，我国年降水量空间分布的总趋势是______夏季风活动不稳定容易造成______灾和______灾．
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