单项选择题
A.prevent heat corrosion to internal components B.increase fuel delivery rate and economy C.prevent pre-ignition D.avoid carbonization of the nozzle tips
If the water level dropped rapidly in the expansion tan...
单项选择题If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a （）
A.loss of suction in the circulating pump B.leak in the primary cooling system C.broken raw water pump shaft D.burned or cracked piston in one cylinder
To minimize the formation of carbon deposits on fuel in...
单项选择题To minimize the formation of carbon deposits on fuel injection nozzles, you should （）
A.avoid using liquid-cooled nozzles whenever possible B.avoid low cooling water temperatures C.avoid prolonged overloading of the engine D.make certain the gasket seal between the nozzle and cylinder head is tight
In a simple mechanical governor, the （）A.centrifugal fo...
单项选择题In a simple mechanical governor, the （）
A.centrifugal force rotates the ball-head B.flyweight centrifugal force is balanced by spring force C.flyweight centrifugal force is balanced by hydraulic pressure D.speeder spring alone actuates the fuel control rod
