Adds a filtration mask fore-mail attachments.
为邮件附件添加过滤关键字。
The mask is washable many times with no loss of filtration effectiveness.
这款口罩可以多次清洗，且不会损失过滤效果。
Objective To evaluate the filtration efficiency of different types of mask filtration materials against non-biological particles aerosol and microbial aerosol.
目的评价不同类型口罩滤材对非生物颗粒气溶胶和微生物气溶胶过滤效率。
Those patients should be given a face mask to wear, preferably one that provides filtration of their expired air.
必须拿口罩给病患戴上，口罩最好能过滤患者呼出的空气。
With HEPA filtration products as an example, it is used in the automobile air filtering, diesel oil filtering and the mask with 99% permeability.
以技术产品HEPA过滤产品为例：用于汽车空气进入过滤和柴油过滤，以及消耗产品具有99%渗透效率的口罩。
A battery powered portable human body carrying electronic human breath filtration device is an electronic nose mask and is the most ideal alternative to conventional filter paper type nose mask.
一种以电池为动力的轻便式人体电子呼吸过滤装置是一个电子鼻罩而且是取代传统过滤纸型鼻罩的最理想的替代物。
This filtration system is light weight with negligible air flow resistance and is integrated into the nose mask which is connected to a pocket size control system via a connection cable.
该过滤系统重量较轻，气流阻 力可以忽略，且与通过连接线与小型控制系统相连的鼻罩融为一体。
This filtration system is light weight with negligible air flow resistance and is integrated into the nose mask which is connected to a pocket size control system via a connection cable.
该过滤系统重量较轻，气流阻 力可以忽略，且与通过连接线与小型控制系统相连的鼻罩融为一体。
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