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

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

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

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

For a given exhaust gas boiler, what is the quantity of its evaporation mainly determined?（）

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

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

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

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

Which one is NOT the ‘clear grounds’ for a more detailed inspection?（）