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

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

The treatment of the fuel oils involves storage, heating, filtering and（）

Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）

Engine parameters shall be corresponded to NOx Technical Files. This is required by （）

As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?（）

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

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

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

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