Which of the following items don’t belong to dock repair works?（）

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

The Port State Control officer may witness a fire drill carried out by the crew assigned to these duties on the（）

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

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

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

Cold weather starting of a diesel engine may be made easier by（）

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

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

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