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

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

During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.

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

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

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

Which of the listed governor characteristics will greatly affect the load sharing relationship between paralleled diesel generators?（）

As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?（）

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

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