Most of the teachers are impressed on some students due to their _____________ characters, such

as cleverness, confidence and   honesty. [ ]

A. actual        

B. potential        

C. steady        

D. average

接户线施工时，（）。

A、周围土壤无突起

B、导线不应松弛

C、每根导线接头不应多于1个

D、须用同一型号导线相连结