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

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

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

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

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

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

Which of the listed governor characteristics will greatly affect the load sharing relationship between paralleled diesel generators?（）

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

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

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