Diesel engine air start system check valves are opened by （）

Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）

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

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

Which of the listed governor characteristics will greatly affect the load sharing relationship between paralleled diesel generators?（）

As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?（）

A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）

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

Using a file without a handle may result in （）

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