Face masks have a certain filtering effect on the air entering the lungs.
The difference between ordinary medical masks and surgical masks is mainly from material and protect...
But wearing a mask and frequent hand washing must be done at the same time, both are indispensable.
First of all, the words "medical surgical mask" must be written on the outside of the package.
A sudden epidemic has made masks a necessity, and the quality of masks has also become a hot spot of...
At the moment when urban life is gradually recovering, everyone still needs to pay attention to wear...