A.To add power to the engine
B.To keep the engine firmly attached to its supporting base
C.To keep moving engine part in their proper relative positions
D.To rotate the crankshaft
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A.droop
B.dead banding
C.dash potting
D.hunting
A.cylinder head cracks
B.piping joints
C.pump leaking
D.all of the above
A.reduce the ring groove wear rate
B.seal against crankcase vapors
C.lessen the wear on aluminum part of the cylinder
D.allow for the greater expansion rate of aluminum
A.a leaking fuel injector nozzle
B.a clogged air filter
C.excessively early fuel injection
D.malfunctioning valves
A.An alarm device with audible and visible signals is required for all cooling water systems
B.Propulsion engines with bores over 200 mm are to be fitted with cooling water jackets
C.Each totally enclosed cooling system shall be provided with a suitable head tank
D.Drain cocks are to be provided at the lowest points of all cylinder water jackets
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（） is not installed on the main switchboar.
Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）
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