单项选择题
In a closed cooling water system, which of the problems can cause the water pressure to fluctuate?（）
A.An open vent in the cooling system
B.A fouled sea chest
C.A restricted water passage in the engine
D.Air entrained in the cooling water
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Proper dispersion of fuel in a diesel engine cylinder is dependent upon the （）
A.injection pressure
B.shape of combustion space
C.turbulence in combustion space
D.all of the above -
单项选择题
A change in engine speed is required before a governor is able to make a corrective movement of fuel rackThis aspect of governing is commonly expressed as a percent and is known as （）
A.governor sensitivity
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单项选择题
Exhaust pyrometer readings provide an indication of the （）
A.effectiveness of water-cooled exhaust elbows
B.distribution of the load between engine cylinders
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