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Helium-oxygen mix

Helium-oxygen mix – artificial gas mix which unlike atmospheric air contains helium instead of nitrogen; it is used for breath under water at immersions on big depths for prevention of a caisson disease, and also in some types of space suits and spacecrafts.

 
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In Great Britain there is a law according to which the surgeon can refuse to do to the patient operation if he smokes or has excess weight. The person has to refuse addictions, and then, perhaps, he will not need an operative measure.