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

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.

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

During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.

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

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

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（）

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

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