The difference between a single-acting and an opposed piston engine is __________.
A. Single-acting piston engines wear longer.
B. Opposed piston engines have cylinders set in a V-shape.
C. Single-acting piston engines have one piston per cylinder and opposed piston engines have two.
D. Single-acting piston engines are used with carburetors and opposed piston engines are used with fuel injectors.
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