Cold weather starting of a diesel engine may be made easier by（）

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

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

The cetane rating of diesel fuel is an indication of the （）

Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）

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

Using a file without a handle may result in （）

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

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

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