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

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

One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）

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

To proceed to the assistance of a ship in distress is（）

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

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

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

（） is not installed on the main switchboar.

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