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

The ISPS Code consists of a mandatory section-Part A, which shows（）

The additional mark （）in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.

Using a file without a handle may result in （）

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

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

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

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?（）

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