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

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

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

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.

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

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

By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engine. The device most commonly used is a（）

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 （）

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