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

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

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

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

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

Under MARPOL Code the ship to which it applies has to carry （）

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

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

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

Cold weather starting of a diesel engine may be made easier by（）