轮机英语船舶动力装置单项选择题每日一练(2019.01.19)

单项选择题
Cooling enables the engine metals （） their mechanical properties.
A.to retain
B.to remain
C.to maintenance
D.to have
单项选择题
The loss of （） from an air compressor could lead to an overheated air discharge and possibly an explosion in the pipelines leading to the air reservoir.
A.lubricating oil
B.compressed air
C.cooling water
D.sealing ring
单项选择题
Which of the following may take place if the clearance of the main bearings are excessive?（）
A.bearing knocks
B.dropping of pressure of LO
C.noises
D.all the above
单项选择题
When a crankshaft has to be handled outside the engine, it should be carefully supported in a manner which will avoid （） high bending moments on it.
A.compressing
B.interposing
C.imposing
D.pounding
单项选择题
Control of the main propulsion diesel engines can be shifted from the engine room to the wheelhouse from the （）.
A.wheelhouse control station
B.engine room control station
C.captains office
D.chief engineers office