The main purpose of port State control is not to（）

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

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

To shut down a diesel engine after it exceeds the set maximum speed，which type of device listed should be used?（）

The treatment of the fuel oils involves storage, heating, filtering and（）

Using a file without a handle may result in （）

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

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

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

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