He ______ as a national hero for winning the first gold medal for his country in the Olympics.

A．considered

B．was considered

C．has considered

D．has been considered

分裂导线子导线装设间隔棒的主要作用是（）。

A、预防相间短路；

B、预防导线混线；

C、防止导线发生鞭击；

D、防止导线微风振动。