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 diesel engine components listed increase air density and helps to improve engine operating efficiency?（）

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

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

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

Which of the listed governor characteristics will greatly affect the load sharing relationship between paralleled diesel generators?（）

The ISPS Code consists of a mandatory section-Part A, which shows（）

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

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

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