请问“Average COD to Mass ratio”怎么解释,具体指什么?

请问“Average COD to Mass ratio”怎么解释,具体指什么? Average Years to Degree是什么意思 请问怎样检测COD, average average average average AVERAGE 请问申请大学中的Average applicants per 英文句子翻译（The average weekly wage)The average weekly wage nearly doubled in the 1970’s, rising from $114 to $220, （yet the average worker ended the decade with a decrease in purchasing power.）请问,上句中括号内的部分如何 请问o tang jy o me de to go za yi ma su是什么语? 请问海关中“单独海损”（P.A particular average)是什么意思? 请问造纸厂的废水COD一般是多少? 请问厌氧挥发酸300COD一千怎么回事? 请问go za i ma 泰语to oplu ma jai 英文数学题Ben cycles to a city at average speed X and returns at average speed Y.His average speedfor the whole trip is ( ) COD处理工艺请问一下一般去除COD用那些工艺,大概原理是什么?