Which of the following refrigerants is a CFC that has already been phased out of production?
a.R-134a
b.R-12
c.R-410A
d.R-1234yf
解析
R-12 is a chlorofluorocarbon (CFC) with a high ozone depletion potential and its production was banned in the United States. R-134a and R-410A are HFCs with zero ODP, and R-1234yf is a low-GWP HFO. CFCs were the first class of refrigerants eliminated under the Montreal Protocol.
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