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

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

The main purpose of port State control is not to（）

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

Which of the following items don’t belong to dock repair works?（）

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

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

Using a file without a handle may result in （）

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

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