gravity heating return ram 重力回程柱塞
gravity heating return feed 重力回水锅炉
gravity heating return system 重力回水系统
gravity heating return of condensate 冷凝水重力回水
open return steam heating system 直接蒸汽供热系统
vacuum return-line heating system 真空采暖系统
mid return steam heating system 中回式蒸汽供暖系统
open return steam heating syste 直接蒸汽供热系统
The energy-saving results of these units can be further improved by widening the regulating range of the extraction pressure and by using tow-stage heating of district-heating return water.
扩大供热抽汽压力调节范围及采用热网回冰的两级加热，可进一步提高该型机组的节能效益。
Modern society may have come full circle: if oil becomes scarce we may have to return to earlier forms of heating and travel.
现代社会也许恢复原状了：如果石油变得稀少，我们可能又回到从前取暖和旅行的方式了。
The key to the use of this technique lies in selecting appropriate solvents, a certain basicity and time enough for return flow in heating.
使用这种方法的关键在于选择合适的溶剂、足够的碱浓度及加热回流时间。
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