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.

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

Using a file without a handle may result in （）

Engine parameters shall be corresponded to NOx Technical Files. This is required by （）

Under MARPOL Code the ship to which it applies has to carry （）

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（）

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

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

Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）

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