Although it is no longer used in the manufacturing of new air conditioning systems, the number of existing systems using __________ is large, so technicians will be encountering this refrigerant for many years to come.
A. R-22
B. R-12
C. R-410A
D. R-134a
Answer: A
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When a general duty split-phase motor reaches approximately 75% of its operating speed, the start winding is de-energized by a ____.
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