A、A. The dark side faces outwards, and the side with the metallic strip faces upwards B. Fold up and down to cover the nose and chin C. Move the metallic strip to make it close to the bridge of the nose to prevent side leakage D. Continue to use contaminated masks
B、A. The dark side faces outwards, and the side with the metallic strip faces upwards B. Fold up and down to cover the nose and chin C. Move the metallic strip to make it close to the bridge of the nose to prevent side leakage D. Continue to use contaminated masks
C、A. The dark side faces outwards, and the side with the metallic strip faces upwards B. Fold up and down to cover the nose and chin C. Move the metallic strip to make it close to the bridge of the nose to prevent side leakage D. Continue to use contaminated masks
D、A. The dark side faces outwards, and the side with the metallic strip faces upwards B. Fold up and down to cover the nose and chin C. Move the metallic strip to make it close to the bridge of the nose to prevent side leakage D. Continue to use contaminated masks