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

（） is not installed on the main switchboar.

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

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?（）

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

To proceed to the assistance of a ship in distress is（）

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

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

The shipboard oil pollution emergency plan will be invalid after （）