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

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

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

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

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

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

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

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

The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated（）

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