The condensers located in various stages of a flash evaporator are cooled by（）

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

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

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

If two A.C.generators are to be operated in parallel, the load is distributed evenly by（）

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

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

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

The cetane rating of diesel fuel is an indication of the （）

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