chemical oxygen demand (COD)的用法和樣例：
例句
- Therefore, COD is a conditional indicator, and strict operation procedure must be followed.
因此，化學(xué)需氧量亦是一個(gè)條件性的指標，必須嚴格按操作步驟進(jìn)行。 - The results showed that magnesium hydroxide had good effect for decoloring and suspended substance removal,meanwhile,removal rate of chemical oxygen demand was also quite high.
研究結果表明，氫氧化鎂在印染廢水的處理過(guò)程中，具有良好的脫色效果和懸浮物的去除效果，對化學(xué)需氧量的去除率也相當高。
