您要查找的是不是：
- COD特征值characteristic value of COD
- 特征值eigenvalue
- CODchemical oxygen demand (COD)
- ｒ重特征值r-fold eigenvalue
- COD值COD
- ＣＯＤ特征值characteristic value of COD
- 高CODhigh COD
- 径流特征值characteristics of runoff
- 低CODlow COD
- 水库特征值reservoir characteristic parameter
- COD/PCOD/P
- CODαCODα
- 变体特征值variant tag value
- 临界CODcritical COD
- 零特征值zero eigenvalue
- COD测定COD determination
- 边值问题特征值eigenvalue of boundary value problem
- COD展开COD expansion
- 年特征值annual eigenvalue
- COD去除COD removal
