Aluminum pistons have _____ coefficient of thermal expansion compared with those of cast iron.

_______ diesel engines generally have two systems of lubrication: a total loss system feeding and a circulating system lubricating the running gear and cooling the pistons.

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Excessive lube oil consumption can result from worn or broken ______________.A.piston ring

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Nowhere in nature is aluminum found free, owing to its always ______ with other elements,

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Ring groove inserts are occasionally used on aluminum alloy piston to_______.A.reduce the

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_____ pistons have low inertia and high coefficient of thermal expansion.A.Cast ironB.Cast

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A fire involving aluminum powder would be a class _____.A."A" fireB."B" fireC."C" fireD."D

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Sputnik I was the first artificial satellite. It can be described as an aluminum【C1】______

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