graded filter meaning in English
层级滤波器
分极过滤器
回水过滤器
级配倒滤层
级配滤池
级配滤器
Examples
- Use activated carbon filter must grade filter before having , otherwise will reduce active efficiency of charcoal because of other pollutant in the air
使用活性碳过滤必须有前级过滤，否则，会由于空气中其它污染而降低活性碳的效率。