When I was young, I was always ____ to my elder brother wherever he went.

A．attached

B．attacked

C．attended

D．surrounded

装置在满负荷生产状态下，提高进料温度的方法有（）

A、提高烟气温度

B、开大烟道火嘴

C、降低炉膛负压

D、提高水碳比