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

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

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

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

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

“Insufficiency of manning or insufficiency of certification of seafarers” is an identification of a（）

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

Using a file without a handle may result in （）

If separating effect is not good, which measure should be taken （）

If two A.C.generators are to be operated in parallel, the load is distributed evenly by（）