During the test, physical parameters, including G profile, anti-G suit pressure, mask pressure, thoracic counterpressure, and physiological parameters including respiratory rate and heart rate were recorded.

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On the foundation of conventional medicine cure, double-level nasal mask/mask ventilation mode is used for the treatment of respiratory failure caused by severe asthma,and it can effectively reduce tracheal intubation rate and cure expenses, and decurtate hospitalization time.

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Chemical incidents, can be used wet towel, wet mask, gas masks protect the respiratory tract.

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