【名词&注释】
加密算法(encryption algorithm)、身份验证(authentication)、控制中心(control center)、一对一(one to one)、非对称(asymmetric)、详细信息(detailed information)、数量级(magnitude)
[判断题]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(magnitude)，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。()
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[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.
A. actors
B. artifacts
C. workers
D. scenarios
[单选题]关于VoIP系统中网守的描述中，正确的是
A. 进行信号调制
B. 进行号码查询
C. 确定网关地址
D. 进行信号压缩与解压
[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)
A. 0个
B. 1个
C. 0个或0个以上
D. 1个或1个以上
[单选题]● 在项目财务评价中，当（）时，项目方案可行。 （）
A. 财务净现值≤0
B. 财务净现值<0
C. 财务净现值0
D. 财务净现值=0
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