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30 August, 09:10

Which best describes why heat pumps are reversible? A. They can heat and cool an indoor space. B. They involve a metal expanding or contracting against another. C. They combust and can also add coolant. D. They allow a piston to move up and down.

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Answers (2)
  1. 30 August, 09:32
    0
    The answer to your question is a
  2. 30 August, 09:39
    0
    Personally I believe it is B.
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