读写器到标签之间的信道叫做后向信道，而标签到读写器之间的信道叫做前向信道。
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选择性泄露的完整性是指：当证书持有者决定泄露证书私有属性信息的时候，泄露出来的值可以是未经认证的过的。
A. 对
B. 错
在用户匿名的认证协议中，通常用户与服务器建立会话，一旦会话建立，服务器不知道跟谁通信。
A. 对
B. 错
The following are the reasons why Britain wants to exit from E.U EXCEPT___
A. Britain was the last world leader
Briain puts itself outside of the European continent.
C. The British think that they are British, not European
D. After joining the EU, the U.gets on well with theE.U
Among the EU Member States, all the countries use the euro except Britain. Why?
A. The status of British pound is much higher than that of the new euro
B. The UK does not want to be integrated with the EU.
C. Both A and B
D. Euro was not launched officially.
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