电油汀的加热管损坏一根，可引起（）故障。
A.通电后加热灯亮但不加热
B.通电后加热灯不亮也不加热
C.加热温度过低
D.加热温度过高
参考答案：C
Not only ______ polluted but ______ crowded.
A．was the city; were the streets
B．the city was; were the streets
C．was the city; the streets were
D．the city was; the streets were
地坪防潮层与墙体垂直防潮层应有可靠的搭接，接头位置高于地面（）
A、200mm
B、大于300mm
C、500mm
D、小于300mm
