Regulations & Safety第 77 / 240 题
Which statement about refrigerant and human health is correct?
a.Refrigerant vapor is nutritious and harmless to breathe
b.High concentrations can cause dizziness, loss of coordination, and asphyxiation by displacing oxygen
c.Refrigerant improves lung function
d.Only liquid refrigerant is a concern, never the vapor
解析
In high concentrations, refrigerant vapor displaces oxygen and can cause dizziness, loss of coordination, and asphyxiation, which is why ventilation and monitoring matter. Refrigerant vapor is not nutritious, does not improve lung function, and both vapor (asphyxiation) and liquid (frostbite) present hazards. Cardiac sensitization is another reason to avoid breathing high concentrations.
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