Which of the Following O₂ Devices Has 2 One-Way Valves

question 40

Multiple Choice

Which of the following O₂ devices has 2 one-way valves and the second valve is at the exhalation ports,which prevents room air from entering the mask during inhalation?

• A) Nonrebreathing mask
• B) Partial rebreathing mask
• C) Aerosol tracheostomy collar mask
• D) Simple mask

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