正确答案:

题目：非对称式加密算法由于多是基于数学难题问题，算法复杂，致使加密速度较慢，与同等安全强度的对称算法相比，一般要慢三个数量级，但是它的优点是通信双方不必事先约定密钥就可以进行安全通信。()

解析：答案：正确

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举一反三的答案和解析：

[单选题]The Rational Unified Process (RUP) is a software engineering process, which captures many of best practices in modern software development. The notions of use-cases and (71) have been proven to be an excellent way to capture function requirements. RUP can be described in two dimensions-time and content. In the time dimension, the software lifecycle is broken into cycles. Each cycle is divided into four consecutive (72) which is concluded with a well-defined (73) and can be further broken down into (74) - a complete development loop resulting in a release of an executable product, a subset of the final product under development, which grows incrementally to become the final system. The content structure refers to the disciplines, which group (75) logically by nature.

scenarios

[单选题]关于VoIP系统中网守的描述中，正确的是

确定网关地址

解析：网守负责用户的注册和管理等。VoIP网守通过被叫号码确定对方的VoIP网关。它是网络中的消息控制中心，它可以进行呼叫控制、地址解析、呼叫授权、身份验证、集中账务和计费管理以及保留呼叫详细信息记录等操作。根据解析，选项C符合题意，故选择C选项。

[单选题]一个数据库系统必须能表示实体和关系。关系可与(42)实体有关。实体与实体之间的关系有一对一、一对多和多对多，其中(43)不能描述多对多的联系。(55)

0个或0个以上

[单选题]● 在项目财务评价中，当（）时，项目方案可行。 （）

财务净现值0

解析：本题考核考生对工程投资控制部分常用知识的了解。