亚洲视频免费一区,国产欧美综合一区二区,亚洲国产观看,91精品啪在线观看国产91九色,日本又黄又粗暴的gif动态图含羞,麻豆国产一区二区在线观看,中文字幕在线二区

A new heating system using treated water is expected to be put into use for thousands of residents in seven areas of Tianjin this winter.

The system, the first of its type ever adopted in Chinese metropolis, is capable of covering 1.5 million square metres of heating area.

Up to 6 million tons of tap water would be saved annually if the new heating system was adopted across the city, experts say.