How often do disposable medical masks need to be changed
The 2020 novel coronavirus pneumonia epidemic is spreading, and the prevention and control of the new coronavirus pneumonia epidemic is facing huge challenges. We must stay at home and not go out. Even if we need to go out, we must wear masks. Wearing a mask is the most important measure to prevent the new coronavirus. How often do we need to change our face shields?
2020-11-18
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