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

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

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

Engine parameters shall be corresponded to NOx Technical Files. This is required by （）

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

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

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

Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）

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（）