單項(xiàng)選擇題() 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


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1.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

2.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

4.單項(xiàng)選擇題() may be the first possible cause which makes the engine to lose power or slow down when it is running.

A.Hot bearing 
B.Starting valves
C.Unequal distribution of load
D.Excessive crankshaft clearance