One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）

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

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

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

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

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

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

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

（）connectors hold best if a wire is accidentally pulled or a connection becomes loose.

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