设备和线路确认无电，应以（）为依据。
A、电流表的指示
B、电压表的指示
C、验电器的指示
D、电度表的指示
参考答案：C
The policeman asked the child _____ so that he could take him home. [ ]
A. where did he live
B. where he lived
C. how he lived
简述马克思劳动价值论的理论和实践意义？
