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The function of the _______ is to convert the up-and-down motion of the piston into rotary motion that can be used to power the vehicle.

Apiston rings

Bcylinder head

Cpush rods

Dcrankshaft

An engine's _______ contains the cylinder head, the valves, the valve train components, the manifolds, and the engine covers.

Abottom end

Bupper end

Cback end

Dlower end