The bioenergy is also called clean energy because it doesn't produce_________.
A: exhaust gas
B: oxygen
C: hydrogen
D: nitrogen
A: exhaust gas
B: oxygen
C: hydrogen
D: nitrogen
举一反三
- The gas with maximum percentage in the atmosphere is ( ). A: nitrogen B: hydrogen C: oxygen D: carbon dioxide
- Why bioenergy is clean energy ?Because there is no （ ）during combustion.
- Solar panels, wind turbines, hydro power and geothermal energy and hydrocarbons (natural gas or coal) can all be used to produce hydrogen (a primary energy).
- 1. The gas with maximum percentage in the atmosphere is .(Nitrogen / Oxygen)
- ( ) is taken in by plants to make food. A: nitrogen B: hydrogen C: oxygen D: carbon dioxide