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單項選擇題

An aluminum piston has lower inertia and higher coefficient of （） compared to that of cast iron.

A.viscosity
B.twisting moments
C.inertia
D.thermal expansion

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單項選擇題

Among the rings of a piston the （） one is subjected to the greatest load and temperature.

A.bottom
B.middle
C.top
D.none of the above

單項選擇題

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

A.higher
B.lower
C.the same
D.none of the above

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