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

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

The main purpose of port State control is not to（）

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

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

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

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

（）connectors hold best if a wire is accidentally pulled or a connection becomes loose.

If separating effect is not good, which measure should be taken （）

The treatment of the fuel oils involves storage, heating, filtering and（）