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

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

The additional mark （）in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.

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

The condensers located in various stages of a flash evaporator are cooled by（）

（）connectors hold best if a wire is accidentally pulled or a connection becomes loose.

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 （）

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

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