At present, the main method of testing air filters is fraction efficiency testing method with particle counter.
以粒子计数器为测试手段的粒径效率测试法是目前过滤器测试的主要方法。
A great number of experiments were carried out on measuring the bacterial removal rate of medium-efficiency filter material in air filters.
通过大量试验，测定了空气过滤器中效滤材的滤菌效率。
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