The main purpose of port State control is not to（）

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

When does auxiliary burner of incinerator put into operation? （）Ⅰ. start incinerator when it is coldⅡ. the sludge for dealing with is littleⅢ. the sludge for dealing with is largeⅣ. the water and impurity in sludge are too muchⅤ. the temperature in incinerator is lowⅥ. dealing with little solid rubbish

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

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

Flame failure in an automatically fired auxiliary boiler can from a/an （）

（） is not installed on the main switchboar.

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

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

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