市政绩效管理监督系统的工作目标中，能够保证市政绩效管理方向正当性的是
A．价值
B．效率
C．顾客满意度
D．流程
参考答案：A
Sorry, I ______ when you spoke. I was thinking about something else. [ ]
A. isn't listening
B. hasn't listened
C. didn't listen
D. wasn't listening
PH值测定仪在检测污水的酸碱性时，如PH值变大，则污水的（）.
A.酸性增强
B.碱性增强
C.酸碱性不变
D.酸碱性减弱
