单项选择题

To shut down a diesel engine after it exceeds the set maximum speed，which type of device listed should be used?（）

A.Speed limiting governor
B.Over-speed governor
C.Over-speed trip
D.Over-speed relay

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Which of the listed governor characteristics will greatly affect the load sharing relationship between paralleled diesel generators?（）

A.Sensitivity
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Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）

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