单项选择题

（） 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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单项选择题

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

单项选择题

（）, 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

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We have planned to remove the piston with the help of assistant engineers during the cargo unloading, while the vessel （）port Shanghai.

A.reaches to
B.gets
C.calls on
D.calls at