Automobile Engineering in ME
Vulcanizing means

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

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

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

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