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mechanical engineering automobile engineering
1. The function of oil-control rings is that it
(A): keeps the cylinder wall lubricated by holding oil in its channel
(B): lubricates the cylinder wall by releasing oil from its hole
(C): maintains a seal and prevents escape of burned gases and oil leakage
(D): prevents engine oil from going into the combustion chamber and returns excess lubricating oil off the cylinder wall through the return holes in the piston to the oil pan
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