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

By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engine. The device most commonly used is a（）

Which one is NOT the ‘clear grounds’ for a more detailed inspection?（）

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

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

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

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

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

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

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