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COVID-19: GB, GB/T, YY, YY/T Chinese Standards

Technical specification of daily protective mask 4 GB 19083-2010: Technical requirements for protective face mask for medical use 5 YY 0469-2011: Surgical mask 6 YY/T 0969-2013: Single-use medical face mask 7 FZ/T 73049-2014: Knitted mask ...

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pm2.5 fold dust mask size Understanding PM2.5 - Cambridge Mask Co. Nov 27, 2015 · PM2.5 is comparatively much smaller in size as compared to other particles and pollutants. Meanwhile, PM 2.5 is particulates that have a diameter of 2.5 micrometers or smaller. These particles are so small that they can only be viewed under a microscope.

Chinese Industry Standard: Miscellaneous -- 2

TAJ 1001-2015: PM2.5 protective mask: TAJ 1001-2015: WS/T 326.1-2010: Efficacy evaluation of toothpaste - Part 1: General principles: WS/T 326.1-2010: WS/T 326.2-2010: Efficacy evaluation of toothpaste. Part 2: Guidelines for anti-caries efficacy evaluation: WS/T 326.2-2010: WS/T 326.3-2010

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Chinese Industry Standard: Miscellaneous -- 2

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cdc.gov

5/1/2020 2020 25 1 4/9/2020. 5/1/2020 2020 25 1. 5/1/2020 2020 1/11/2020. 5/1/2020 2020. 5/1/2020 2020. 5/1/2020 2020 32352310. 5/1/2020 2020 1/7/2020. 5/1/2020 2020 ...

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