Purpose:Filtering dust and prefiltration in the air conditioning program.
用途：粗尘过滤，空调通风系统保护性预过滤。
Active carbon adsorption, prefiltration, membrane filtration are applied in this trial.
试验采用了活性炭吸附、过滤、过滤的工艺路线。
In some cases, manufacturers have performed bioburden testing on bulk solutions after prefiltration and prior to final filtration.
在一些案例中，生产厂商，在原液进行预滤后，在进行最终过滤前取样进行微生物污染水平测试。
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