單項(xiàng)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


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1.單項(xiàng)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

2.單項(xiàng)選擇題Auxiliary machinery covers everything onboard except ().

A.main engines
B.main boilers
C.pipes and fittings
D.A and B

4.單項(xiàng)選擇題To maintain the down stream pressure within defined limits over a range of flow and despite any changes in supply pressure, () is fitted.

A.a check valve
B.a gate valve
C.a pressure reducing valve
D.a quick closing valve

5.單項(xiàng)選擇題The main objective of the SOLAS Convention is to specify () for the construction, equipment and operation of ships, compatible their safety.

A.at most references
B.at least references
C.maximum standards
D.minimum standards