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

The Port State Control officer may witness a fire drill carried out by the crew assigned to these duties on the（）

（） is not installed on the main switchboar.

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

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

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

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

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

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

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