2008届本科毕业生从事的行业大类排名中，批发业的平均月收入排在第几位( )A．6

2008年北京奥运会圣火在全球传递的里程约为137 000km，用科学记数法表示为（　　）

A．1.37×10³km

B．137×10³km

C．1.37×10⁵km

D．137×10⁵km

不属于吩噻嗪类抗精神病药的药物是（）

A.氯丙嗪

B.三氟拉嗪

C.氯普噻吨

D.硫利哒嗪

E.奋乃静

实验室常用MnO₂和浓盐酸混合加热来制取少量的氯气，反应的化学方程式为：MnO₂+4HCl(浓)MnCl₂+Cl₂↑+2H₂O。

试回答以下问题：

(1)在上述反应中，盐酸表现出来的性质是____________。

(2)如果用图中装置D收集氯气，则气体应从____口进入。

(3)将制得的氯气经干燥后依次通过图中A、B、C三个装置， 其中A中盛有干燥的红色布条，B中盛的是用蒸馏水润湿的红色布条，烧杯中盛的是浓烧碱溶液。实验中可以观察到A、B中的现象是_____________。

(4)装置C的作用是________，写出反应的离子方程式________________，在该反应中氧化剂是_______，还原剂是_________。

导游人员的着装，上衣、裤子、鞋乃至帽子、围巾在色彩、质地上要______，服装要与形体______。

(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．Certificate
B．Encryption
C．Tunnel
D．Presentation