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

Using a file without a handle may result in （）

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

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

When does auxiliary burner of incinerator put into operation? （）Ⅰ. start incinerator when it is coldⅡ. the sludge for dealing with is littleⅢ. the sludge for dealing with is largeⅣ. the water and impurity in sludge are too muchⅤ. the temperature in incinerator is lowⅥ. dealing with little solid rubbish

Diesel engine air start system check valves are opened by （）

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

The shipboard oil pollution emergency plan will be invalid after （）

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

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