单项选择题
A.The watch keeping personnel B.The chief engineer C.The person on a bunker barge D.Any of the above
（） pistons have low inertia and high coefficient of the...
单项选择题（） pistons have low inertia and high coefficient of thermal expansion.
A.Cast iron B.Cast steel C.Forged steel D.Aluminum
（） of the A-frames there is a strong cast iron frame ca...
单项选择题（） 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
（） of an engine crankshaft can be detected by measuring...
单项选择题（） 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
