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

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

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（）

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

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

To shut down a diesel engine after it exceeds the set maximum speed，which type of device listed should be used?（）

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

Using a file without a handle may result in （）

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