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单选题
The selection of an oil depends （） on the operating conditions, the design of the engine and the type of fuel to be burned.
A
to a great extent
B
on a great extent
C
on mainly
D
on only
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pay attention to operating parametersB
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单选题The selection of a lubricating oil depends to a great extent on the operating conditions,（）.A
the type of coolantB
the design of the engineC
the type of fuel to be burnedD
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单选题The selection of an oil depends （） on the operating conditions, the design of the engine and the type of fuel to be burned.A
to a great extentB
on a great extentC
on mainlyD
on only
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单选题The ash content of a fuel oil is significant to the operating engineer because it （）A
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Take all exhaust temperature readingB
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单选题In a normally operating diesel engine, the main cause of lubricating oil contamination in the crankcase is a result of the （）.A
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degree of cylinder air turbulenceB
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quality of fuel to be injectedD
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单选题The furnace of an oil fired boiler should be （） before the operating burner is lit.A
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purgedC
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None of the above is true
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