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

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

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

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

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

The shipboard oil pollution emergency plan will be invalid after （）

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

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（）

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

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