... high concentration, dustless, asepsis, medical pure oxygencontinuously from the air in the normal temperature after connected the ... : Respiratory system----rhinitis, faucitis, catchcold,etc.;B: Neural system----neurasthenic, insomnia, migraine, etc.;C: Blood----leucopenia;D:Digestive system----coprostasis, ... maintained for its whole life, without man-made factors.B.The following situations belong to the ...