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Which one of the following is an efficient way of using energy?

Which one of the following is an efficient way of using energy?
A. Drying grain using solar.
B. Using a vacuum flask to keep tea hot.
C. Using biogas.
D. Putting off wood fire when not in use.

Answers


sharon
The correct answers B. Using a vacuum flask to keep tea hot.
sharon kalunda answered the question on July 29, 2019 at 11:02

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