这款口罩可以多次清洗，且不会损失过滤效果。
The mask is washable many times with no loss of filtration effectiveness.
介绍了试验设备及测试方法，通过试验得出过滤风速和压力损失变化关系。
Then, the test equipment and experiment is introduced. Through experiment, we get the relation between velocity and filter pressure drop.
比较了砂滤和纤维球过滤对浊度、COD、SS和油的去除情况，及其在水头损失、过滤周期和产水量等方面的异同。
The sand filtration is compared with fibre-ball filtration on the removal rate of turbidity, COD and SS, and on the head losses, filtration period and filtrate.
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