Why bioenergy is clean energy ?Because there is no （ ）during combustion.
Why bioenergy is clean energy ?Because there is no （ ）during combustion.
The bioenergy is also called clean energy because it doesn't produce_________. A: exhaust gas B: oxygen C: hydrogen D: nitrogen
The bioenergy is also called clean energy because it doesn't produce_________. A: exhaust gas B: oxygen C: hydrogen D: nitrogen
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