?Which is true of a submerged heat exchanger?
A. ?It is used to extract heat from lakes and exchanges water directly with the lake.
B. ?It is used to extract heat from lakes and does not exchange water directly with the lake.
C. ?It is used to extract heat from the ground as part of a pressurized system.
D. ?It is used to extract heat from the ground as part of an unpressurized system.
Answer: B
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