同一线路中的电极称为（）。
参考答案：成对电极
We arrived at work in the morning and found that somebody ______ into the office during the night.
A. broke B. had broken C. has broken D. was breaking
地籍是一门兼具（）的应用科学。
A.务实性
B.实践性
C.理论性
D.操作性
E.时效性
