在一个城市内部的两个不同区域间搭建的网络称为（）
A.城域网
B.局域网
C.万维网
D.广域网
参考答案：A
简述毛细管电泳基本工作原理和毛细管电泳的特点。
You are taking over a project and determine the following：Activity B has an early finish(EF)of day 3，a late finish(LF)of day 6，and an early start(ES)of day 2．Activity L is being done by a hard-to-get resource．The cost performance index(CPI) is 1.1 and the schedule performance index(SPI)is 0.8．Based on this information，what would you be more concerned about ？（）
A．Float
B．Resources
C．Cost
D．Schedule
