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單項(xiàng)選擇題

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

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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

單項(xiàng)選擇題

With respect to the flow of lubricating oil through a diesel engine, the lube oil coolers are located after filters in order to （）.

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

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