污泥厌氧硝化的影响因素有______。

A．硝化温度中温、高温

B．有机负荷、投配率与污泥龄的关系

C．pH值与碱度

D．营养配比

______ in diving suits, they walk around in this magic world, lighted by the lamps of the ship.

A．Dressing

B．Dressed

C．To dress

D．Being dressed