单项选择题

When a vessel is in dry-dock, the vessel’s engineers should （）.

A.examine the condition of the propeller
B.chip and paint all hull protection zincs
C.install new docking plugs in all cofferdams
D.inspect the hull for hogging or sagging

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Air line lubricators are used in compressed air systems to lubricate （）.

A.the suction and discharge valves
B.tools and equipment served by compressed air
C.air line reducing valves
D.all of the above

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Which of the listed devices would be installed at a control system air pressure reducing station?（）

A.Moisture separator
B.Vacuum breaker
C.Lubricator
D.Non-return valve

单项选择题

Power is defined as the （）.

A.rate of doing work
B.amount of force needed to overcome friction
C.amount of work accomplished
D.distance through which an object is moved