项目后评价的项目目标适应性分析主要是评价项目( )。
A．原定目标是否正确
B．原定目标的实现程度
C．目标设定的依据
D．成功度
参考答案：A
综合负荷模型是反映实际电力系统负荷的（）特性的负荷模型。
A.频率
B.电压
C.时间
D.空间
―He’s never advised to achieve a balance between his job and hobbies, ________?
―Yes. His parents and teachers often offer him some advice.
A．has he
B．is he
C．hasn’t he
D．isn’t he
