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

Diesel engine air start system check valves are opened by （）

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

Under MARPOL Code the ship to which it applies has to carry （）

（） is not installed on the main switchboar.

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

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

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

A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）

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