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

Which of the following items don’t belong to dock repair works?（）

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

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

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

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

The shipboard oil pollution emergency plan will be invalid after （）

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

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（）