PV cells [br] Ground-source heat pumpsA、are not yet available for domestic use.

游客2024-01-07 58

问题 PV cells [br] Ground-source heat pumps

选项 A、are not yet available for domestic use.
B、produce four times more energy than they use.
C、can save over ￡8000 a year.

答案 B

解析

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