Experts from epidemic prevention and control ｜ "Medical masks do not have much effect on Omikon's mutant strains." Is it true?
Pomegranate/Xinjiang Daily reporter Su LupingRecently, there are rumors in the society that the medical mask has little protective effect on Omircong's mutation strains. Is there a scientific basis...
In the first half of the month, the concentration of the intensive and rough particles in Beijing (townships) in Beijing was released!
The Beijing Ecological and Environment Bureau reported on the 19th that from July ...