为什么贴现率不宜直接作为折现率？
Which of the following packages maintains information in the recovery catalog？ （） ["DBMS_RCVMAN","DBMS_RMAN","DBMS_RCVCAT","DBMS_CATPROC"]
收费不适合用于（）。 ["军队","司法","基础教育","公共事业开支"]
下列文化成就属于秦汉时期新发展的是（）。①留下了世界上关于太阳黑子的最早记录②形成了中国古代完整的数学体系③奠定了祖国医学理论基础④兴起了新的文学体裁――赋 ["①②③④","①②","②③","②③④"]
Which optimize phase service component assesses the current state of the network management infrastructure of a customer to identity issues and opportunities that lead to recommendations for improving the ability to manage their Cisco Unified Communications system（） ["Deployment Assessment","Technology Assessment","Security Assessment","Operations Assessment"]
简述电子商务交易安全的基本特征。
