单项选择题
In a modern internal combustion diesel engine, the load carrying part of the engine is referred to as the（）
A.bedplate or base
B.sump or oil pan
C.cylinder block
D.frame
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Black smoke exhausting from an operating diesel engine is an indication of poor combustion which may be caused by （）
A.water in the fuel
B.insufficient fuel for combustion
C.clogged air intake passages
D.burning lubricating oil -
单项选择题
Increasing the compression ratio of a diesel engine while maintaining the designed rate of fuel flow will result in （）
A.increased horsepower
B.reduced efficiency
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An emergency diesel generator should automatically shut down in the event of （）
A.dangerous over-speeding
B.a loss of lube oil pressure
C.activation of the fixed CO2 system for the emergency generator space
D.all of the above
