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哪种口罩更防霾?
目前市场上销售的普通口罩及一次性无纺布口罩对于灰尘和大颗粒物可能有一定的阻挡效果,但是对于雾霾、PM2.5或细菌、病毒等微生物颗粒的防护是不够的,建议可选择标有KN95或N95(过滤非油性颗粒物最低效率为95%)、FPP2(最低过滤效率94%)的口罩。
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Senate passes funding bill
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Swatting call about gunman
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To host Golden Globes
Top FDA lawyer resigns
Top intelligence agency visit
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Khalil sues Columbia
March megastorm
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$3B deal to extend rights
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Influential WY senator dies
Senate confirmation hearing
Permanently shuts route
Teixeira pleads guilty
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