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

（） is not installed on the main switchboar.

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

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

The cetane rating of diesel fuel is an indication of the （）

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

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

The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated（）

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

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