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.

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

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

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

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

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