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單項選擇題

Starting air for auxiliary engines may be taken directly from the main reservoirs or through （）.

A.an auxiliary reservoir
B.a controlling air bottle
C.an emergency air compressor
D.a main air compressor

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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

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