Exhaust valve grooving and corrosion is caused by certain components of residual fuel oilThese components are sodium, sulfur, and （）.

Which of the following problems may occur if the opening pressure of a fuel injection nozzle is greater than specified by the engine manufacturer?（）

A.The amount of fuel injected will be increased
B.The start of injection will be retarded
C.The nozzle will permit fuel to dribble
D.The spray pattern will be distorted

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The required amount in the change of speed necessary before a governor will make a corrective movement is known as （）.

A.speed droop
B.sensitivity
C.stability
D.promptness

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