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單項(xiàng)選擇題

（） pistons have low inertia and high coefficient of thermal expansion.

A.Cast iron
B.Cast steel
C.Forged steel
D.Aluminum

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單項(xiàng)選擇題

（） of the A-frames there is a strong cast iron frame called the scavenging air box.

A.At the top
B.At the bottom
C.In the top
D.In the bottom

單項(xiàng)選擇題

（） of an engine crankshaft can be detected by measuring deflections of crank webs for each unit of the engine.

A.Misalignment
B.Length
C.Strength
D.Stresses