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[GB 2626 2006, definition 3.17] 3.12 Dead space It refers to the volume of the re inhaled gas from the previous exhalation, eed by the volume fraction of carbon dioxide in the inhaled gas. 3.13 Face mask belt It refers to the belt used to fix the mask to the head and

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[GB 2626 2006, definition 3.17] 3.12 Dead space It refers to the volume of the re inhaled gas from the previous exhalation, eed by the volume fraction of carbon dioxide in the inhaled gas. 3.13 Face mask belt It refers to the belt used to fix the mask to the head and

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