单项选择题
A.main bearings B.connecting rod bearings C.piston pin bushings D.All of the above
After a normal, or safety shutdown, automatic combustio...
单项选择题After a normal, or safety shutdown, automatic combustion control systems for an auxiliary boiler are designed to prevent the immediate refiring of a burner in order for the （）.
A.furnace to be re-purged B.electric charge to buildup in the igniter C.fuel pump to restart D.dram level to stabilize
Maintaining the lowest possible scavenging air temperat...
单项选择题Maintaining the lowest possible scavenging air temperature at all times is not recommended due to the possibility of the （）.
A.air charge density becoming too high B.piston crown surfaces becoming too cold C.formation of excessive quantities of condensate D.compression pressure being greatly reduced
In any diesel engine closed freshwater cooling system, ...
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
