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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.

A. piston rings
B. cylinder head
C. push rods
D. crankshaft

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

A. bottom end
B. upper end
C. back end
D. lower end