A.an improper rudder response
B.hammering noises in the equipment or transmission lines
C.popping or sputtering noises
D.all the above
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A.clean the fittings before they are disconnected
B.Place drip pans under leaky fittings
C.Seal any cracks in lines with Permatex
D.Coat all threads with graphite oil
A.molecular fluid vibration
B.energy losses
C.wide pressure variations
D.mechanical damage to control valves
A.provide an area where air can separate from the oil
B.provide an area to separate solid contaminants from the oil
C.act as an oil and water separator
D.absorb shocks occurring in the system
A.act as a shock absorber
B.maintain the stored oil under pressure
C.act as a base or foundation for the power unit
D.eliminate pressure surges in the system
A.admit only enough fresh outside air to provide proper ventilation
B.reduce the air reheating system load
C.lower the compressor head pressure
D.operate the purge recovery unit continuously
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（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
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Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）
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The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated（）
Engine parameters shall be corresponded to NOx Technical Files. This is required by （）
（）connectors hold best if a wire is accidentally pulled or a connection becomes loose.
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