______ is an energy form found in nature that has not been subjected to any human engineered conversion process. It is energy contained in raw fuels, and other forms of energy received as input to a system.
举一反三
- ______ is an energy form found in nature that has not been subjected to any human engineered conversion process. It is energy contained in raw fuels, and other forms of energy received as input to a system.( ) A: Premium energy B: Primary energy C: Principal energy D: Preliminary energy
- Energy conversion, which means the transformation of different energy forms, constitute the basic process of our energy usage.
- Human beings have been depending heavily on fossil fuels to meet their increasing energy demands since the Industrial Revolution.
- Electricity generation is the process of converting some form of energy ___ electricity.
- Electricity, like other forms of ______ has greatly increased in price. A: strength B: force C: power D: energy