The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated（）

For a given exhaust gas boiler, what is the quantity of its evaporation mainly determined?（）

Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）

（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.

The cetane rating of diesel fuel is an indication of the （）

During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.

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?（）

Using a file without a handle may result in （）

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