Automobile Engineering in ME
Vulcanizing means

Spraying with special paint
Melting rubber while stirring it
None of the listed here
Heating rubber under pressure

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Automobile Engineering in ME
The function of a radiator fan in the cooling system is that

It blows air through the radiator when necessary
It cools the engine by blowing air onto the cylinder block
It is turned by wind force as the vehicle moves forward, and its rotation drives the water pump
It draws heat out of the engine compartment

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