定流量冷凍水二級泵
Secondary cooling-water pump with constant discharge
供熱係統內管道和組件絕熱
insulation for pipes and compoments in heating system
組合式冷卻水機組
combination cooling-water pump unit
空氣換熱器進行熱回收
heat recovery by heat exchanger
緊湊型日光燈(上帝啊怎麽還有鬆散型的嗎?)
Compact lamp