通过对比测试，结果发现使用自动检测仪器方法与使用重铬酸盐法测定不同水样的COD值时，两者没有显著性差异。

Through the contrast test, the author discovered that no obvious difference could be found in determining COD by using both methods of instrumental detection and dichromate process.

youdao

通过对比测试，结果发现使用自动检测仪器方法与使用重铬酸盐法测定不同水样的COD值时，两者没有显著性差异。

Through the contrast test, the author discovered that no obvious difference could be found in determining COD by using both methods of instrumental detection and dichromate process.

youdao