NRB: how to use
Thank you so much for explaining this
I never know about the 15L thing till today lol, but I always do 15L using it in the past as when I think someone need NRB, I just put the O2 straight up to it...
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Thank you so much for explaining this
I never know about the 15L thing till today lol, but I always do 15L using it in the past as when I think someone need NRB, I just put the O2 straight up to it...