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單項選擇題

Two main lubricating oil pumps are usual and are obligatory in （）.

A.container ships
B.bulk carriers
C.passenger ships
D.barges

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單項選擇題

In motor-ships, （）, after passing through main and motion bearings and oil cooled pistons, etcis either retained in the bedplate.

A.the fuel oil
B.the lubricating oil
C.the refrigerating oil
D.the hydraulic oil

單項選擇題

In motorships，there are two main circuits, （）.

A.one salt water, one fresh water
B.one salt water, one fuel
C.one fresh water, one fuel
D.one steam, one fuel

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