There was a sudden burst of light ______ a terrible noise.

A．following

B．to follow

C．followed

D．followed by

电除尘器除尘效率受烟气工况条件影响，下面分析了运行时四种单因素对同台电除尘器净化效率的影响，找出观点错误的选项。（）

A.烟气量变大，电除尘效率降低

B.烟气湿度增加，电除尘效率提高

C.进口含尘浓度增大，出口排放浓度也增大，除尘效率降低

D.粉尘粒径变大，电除尘效率提高