helping to 3)______________ and save energy.
举一反三
- helping to 3)______________ and save energy. A: prove security B: improve C: improving security D: improve security
- The ______cell can convert the energy of sunlight into electric energy.
- _____ is a machine by which electrical energy is transformed into mechanical energy.
- In the future, China's energy consumption will still be dominated by fossil energy, in which coal is the main energy.
- The production process of thermal power plant is to convert () of fuel into electric energy. A: chemical energy B: heat energy C: mechanical energy D: kinetic energy