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The engine mechanism, also known as the connecting rod–crank mechanism, has the role of transforming the rectilinear-alternating motion of the piston into the rotational motion of the crankshaft.
The mobile components of the engine mechanism are: the piston, the piston rings, the pin, the connecting rod, the crankshaft and the flywheel. These are responsible for transmitting the force generated by the combustion of the fuel and transforming it into rotational motion.
In contrast, the engine block, the cylinder head, the oil pan and the cylinders are fixed parts of the engine, which provide support and protection for the mobile components, without having their own motion.
The correct answer is: B
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