Flame failure in an automatically fired auxiliary boiler can from a/an （）

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

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

Which one is NOT the ‘clear grounds’ for a more detailed inspection?（）

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 condensers located in various stages of a flash evaporator are cooled by（）

Using a file without a handle may result in （）

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