Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）

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

To shut down a diesel engine after it exceeds the set maximum speed，which type of device listed should be used?（）

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

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

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

The Port State Control officer may witness a fire drill carried out by the crew assigned to these duties on the（）

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

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

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