____ is used to produce electric power.
举一反三
- Waterfalls can be used to produce ______ power.
- Burning waste ______ energy that can be used for electric power or heating.
- About (one-fifth) of (all) the energy (used) in the United States (are) changed into electric power.（） A: one-fifth B: all C: used D: are
- Please choose the main types of the power steering system used in cars today. A: Hydraulic Power Steering (HPS) B: Electric Power Steering (EPS) C: Electro-Hydraulic Power Steering (EHPS)
- The plus (+) and minus (-) signs in an electric circuit diagram are used to define . A: . voltage polarity B: . current direction C: . power flow D: . absorbed power