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

The additional mark （）in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.

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

（） is not installed on the main switchboar.

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 （）

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

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（）

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