The interior surfaces of ductwork offer resistance to airflow, reducing the __________ of the air moving through it and thus the air conditioning system's operating efficiency.
A. cleanliness
B. density
C. humidity
D. velocity
Answer: D
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Mourning doves are by far our most common and widespread dove
a. True b. False Indicate whether the statement is true or false
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When a chiller using R-11 is operating, the low pressure side of the system ____.
A. always shows a positive pressure B. is always in a vacuum C. contains a mixture of oil and air D. rejects oxygen and moisture
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Why are oil lifts needed in tall vertical refrigerant risers?
What will be an ideal response?
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Arrowheads are used to terminate ______________________________ and ____________________.
Fill in the blank(s) with the appropriate word(s).
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