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

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.

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?（）

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

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

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

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

（） is not installed on the main switchboar.

Which of the following items don’t belong to dock repair works?（）