JamesMartin认为企业信息系统的建设应以【 】为中心。
参考答案:数据
解析:J.Martin认为,数据是企业最为宝贵的财富,因此系统开发应以企业的数据为中心。
已知数列{an}前n项和为Sn,若Sn=2n-1,则a8=______.
Your schedule analysis has shown that your project has a high likelihood of experiencing a schedule overrun. You know this because the cumulative EV is much ______ .
A.higher than the cumulative AC
B.higher than the cumulative PV
C.lower than the cumulative PV
D.lower than the cumulative CPI