题干
He was________at the sight of the________that the earthquake caused.
A：frightened and shocked; destroy
B：frightened and shocked; damage
C：frightening and shocking; ruin
D：frightening and shocking; harm
答案(点此获取答案解析）
B
的输电线输电给940km外的用户，其输出电功率是3×106kW。现用500kV电压输电，则下列说法正确的是
