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

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

If separating effect is not good, which measure should be taken （）

“Insufficiency of manning or insufficiency of certification of seafarers” is an identification of a（）

When does auxiliary burner of incinerator put into operation? （）Ⅰ. start incinerator when it is coldⅡ. the sludge for dealing with is littleⅢ. the sludge for dealing with is largeⅣ. the water and impurity in sludge are too muchⅤ. the temperature in incinerator is lowⅥ. dealing with little solid rubbish