In what year did it become necessary for all HVAC technicians to become certified to handle refrigerant under Section 608 of the Clean Air Act?
A. 1987
B. 1992
C. 1994
D. 1996
Answer: C
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What will be an ideal response?
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If a malfunction in an electrical system results in improper system operation, the computer may minimize the effects by using ____ action.
A. fail hard B. fail open C. fail soft D. fail closed
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