围绝经期早期阶段雌激素变化（）
A.水平升高
B.水平降低
C.水平不变
D.水平波动
E.水平极低
参考答案：D
Earned value analysis is an example of （）.
A.performance reporting
B.planning control
C.Ishikawa diagrams
D.integrating the project component sintoawhole
