The design and lectotype of circulating pump, automatic return water switch valve, expansion tank and atmospheric connection pipe in atmospheric hot water heating boiler room are discussed.

对常压热水供热锅炉房的循环泵、回水自动启闭阀、膨胀水箱、大气连通管的设计选型进行了探讨。

youdao

This switch has decreased pollution in the country's major lakes and reservoirs and made drinking water safer for people.

这一转变已降低了中国主要湖泊和水库的污染，使人们的饮用水更加安全。

youdao

But with energy, or food, customers have options: they can switch from oil to natural gas, or eat more chicken and less beef. There is no substitute for water, not even Coca-Cola.

但是，能源、食物消费者可以有所选择：可以用天然气取代石油或者多吃些鸡肉少吃些牛肉，而水，甚至可口可乐，却无可替代。

youdao

At present, in order to switch water supplier, a firm or organisation must use more than five million litres of water a year at a single set of premises - in Wales that threshold is much higher, currently 50 million litres.

BBC: Queen's Speech: Meters 'missing from water bill'

Radical versus incremental change - how to SWItCH urban water systems to meet current and future challenges?

UNESCO: World Water Assessment Programme (WWAP)

The Bill also aims to encourage competition by allowing business customers to switch their water and sewerage supplier.

BBC: Finance