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

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

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

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

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

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

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

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

One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）

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（）