“Insufficiency of manning or insufficiency of certification of seafarers” is an identification of a（）

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 （）

（）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 （）

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

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

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

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

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