Which of the following is true of chlorofluorocarbons?
A) They have been used to power internal combustion engines.
B) They are used in refrigeration systems,to make foam products and as propellants in spray cans.
C) They are used to reduce friction in the braking system of automobiles.
D) They are used to regulate the thermal conductivity of the tiles on the outside of the International Space Station.
Correct Answer:
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