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

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