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MATCHING
Identify the letter of the choice that best matches the phrase or definition.
-A value that a user enters whenever a query is run.
Fuel-Cell Cars
Vehicles that generate their power from a fuel cell, which produces electricity through a chemical reaction between hydrogen and oxygen, emitting only water.
Combustion Engine
An engine that generates mechanical power by burning a fuel-air mixture to create an explosive reaction.
Hydrogen
A chemical element with the symbol H and atomic number 1, known as the lightest element in the universe and a primary component in water molecules.
Commercial Energy
Energy produced and sold for profit, including electricity, natural gas, and other fuels used in the industrial, commercial, and residential sectors.
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