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NADCA Air Systems Cleaning Specialist
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Question #9
#9
Multiple Choice
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The MOST common types of fuel consumed in modern residential HVAC systems are:
A.
natural gas, propane, and oil
B.
electric, propane, and oil
C.
natural gas, methane, and oil
D.
natural gas, propane, and ethanol
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Exam ASCS Topic 1 Question 9
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