一个无盖的玻璃鱼缸，长6分米，宽3分米，高4.5分米．里面装有一些水，水面高3分

.I invited him to dinner, but he___ my invitation with thanks.

A．approved

B．declined

C．ignored

D．abandoned

计算机在管理中的应用的主要发展趋势包括
　　Ⅰ．面向高层的管理决策　　Ⅱ．面向综合应用
　　Ⅲ．面向智能应用　　Ⅳ．面向全社会的信息服务
　　Ⅴ．面向基层

A．Ⅱ．Ⅲ，Ⅳ和Ⅴ

B．Ⅲ，Ⅳ和Ⅴ

C．全部

D．Ⅰ，Ⅱ，Ⅲ和Ⅳ

什么是路由器？它主要提供哪些功能？

Completion estimate (EAC) is the overall final value of a schedule activity, the WBS component, or the expected or planned project, when the project is defined. Which of the following information is required in order to compute EAC, assuming no management intervention is required ？（）

A．to the current date of the EV and the actual cost of AC

B．cost performance index CPI and cost variable CV

C．to the current date of the actual cost of AC and the cost performance index CPI

D．the actual cost of AC and ETC to the current date

L2层交换对（）的处理方式是将它复制到除源端口外的所有端口。