单项选择题

（） the cylinder will contain a great weight of air and will be capable of burning a great quantity of fuel.

A.At the beginning of the compression stroke
B.At the beginning of the suction stroke
C.At the end of the working stroke
D.At the end of the exhaust stroke

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单项选择题

（） should not undertake any task which will interfere with the supervision duties relating to the main machinery and associated equipment.

A.The watch keeping personnel
B.The chief engineer
C.The person on a bunker barge
D.Any of the above

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

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