用英文回答COD是指MLSS是指？

OK ^_^

Abstract: Guang Zhou City Huangpu development zone sewage treatment factory population condition the main body of a book is introduced.

Keywords: Foul water
handles one.
Practice purpose:

Producing practice is that the student is important study the very important practice link. Practice is everyone graduate of university necessarily required course, not only it let us learn to have arrived at much the knowledge less than going to school at all on the classroom, make us lay a solid foundation in having widened ken , having increased experience , having been that we apply what be learned knowledge to actual job better hereafter. By the fact that producing practice makes me contact a professional knowledge more thorough,further, know the environmental protection work reality , know a ring