单项选择题

In any diesel engine closed freshwater cooling system, the lowest pressure exists at the （）.

A.jacket water outlet
B.cooling water pump outlet
C.heat exchanger outlet
D.expansion tank atmospheric vent

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单项选择题

A.allow filtration of less viscous oil
B.decrease the pressure drop across the filter
C.improve overall filtration
D.all of the above

单项选择题

A.line shaft bearings
B.connecting rod beatings
C.main bearings
D.support bearings

单项选择题

A.fuel pump failure
B.fan motor failure
C.increased feedwater consumption
D.decreased boiler efficiency