在电价低的供电线路上，私自接用电价高的用电设备或私自改变用电类别的行为属违约用电。
参考答案：对
The man _____ was a friend of mine. [ ]
A. you just talked to
B. whom you just talked to him
C. who you just talked to him
D. which you just talked to
在中国历史上，权力政治观的代表当属春秋战国时期的（）。
