單項選擇題（） can be found on most medium to large merchant vessels even if the main engine is either a steam turbine or 2-stroke crosshead engine.

A.The medium speed 4-stroke trunk piston engine
B.The low speed 2-stroke crosshead engine
C.The medium speed 2-stroke crosshead engine
D.The low speed 4-stroke trunk piston engine


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1.單項選擇題The difference between a supercharged engine and an un-supercharged engine is that （）.

A.the later
B.the latter
C.the former
D.the farmer

2.單項選擇題（）, the following possible causes should be investigated.

A.Should the engine stop without apparent reason
B.The engine should stop without apparent reason
C.The engine stops without apparent reason
D.The engine is stopped without apparent reason

4.單項選擇題（）does it take to change the main engine from ahead to astern?

A.How many times
B.How much water
C.How long
D.How length

5.單項選擇題（）, we continued lifting out the pistons.

A.Late as it was
B.As it was late
C.Since it was late
D.Because of its late