【单选题】In the sentence “In some designs the cylinder oil is timed so that the oil injects only on the piston ring belt.”, the 'piston ring belt' means _____.
【简答题】The oil pan is usually formed of pressed steel. It usually holds 5 to 10 liters of oil, depending on the engine design .The oil pan and the lower part of the cylinder block together are called the cra...