[摘要]：英语作文我的变化_作业帮I have changed a lot.I used to be short and had a large build.But now I am much taller and thinner.I was lazy befor...
[摘要]：cod的英文全称?COD是英文Chemical Oxygen Demand的缩写,COD的中文意思是化学需氧量。所谓化学需氧量(COD),是在一定的条件下,采用一定的强氧化剂处理...
