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QID - 27431

Spaces containing gasoline-powered machinery or gasoline storage tanks on small passenger vessels should have ventilator ducts that extend to the bilges because __________.

Gasoline vapors are heavier than air, tend to settle in the bilges, and create an explosion hazard 
            
oil and water mix there 
            
air is heavier than gas fumes 
            
it prevents air from entering or leaving the space 
            

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