單項(xiàng)選擇題

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

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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

單項(xiàng)選擇題

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