Automobile Engineering in ME
The battery is an electrochemical device, which means battery

Uses chemical action to provide electricity
Does not use an electrolyte
Has curved plates instead of flat plates
Makes chemicals by mechanical means

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Automobile Engineering in ME
The purpose of a cylinder head gasket is to

None of these
Removes impurities from cylinder head lubricating oil
Prevent the combustion gases from leaking from the joint between the cylinder block and the cylinder head
Prevent engine oil from going into combustion chamber

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