亚洲精品无码久久久久下载,亚洲中文无码精品卡通,国产人妻熟女ⅩXX高跟丝袜写真,性色AV无码久久一区二区三区

Language

Location:News / Industry News / Method to reduce cavitation damage of centrifugal pump
Two types of submersible axial flow pump water shortage
Time:2021-06-26Click volume:
  1. Physical water shortage. Even if some countries have adopted high water production and utilization efficiency, there is not enough water to meet the future water treatment needs of submersible axial flow pumps for agriculture, people’s lives, industry and the environment. We call water physical shortage.Two types of submersible axial flow pump water shortage
    Two types of submersible axial flow pump water shortage

    2. Economic water shortage. Some countries have sufficient water sources, but lack funds, or face serious financial and development problems, and cannot develop these water resources. This situation is called economic water shortage. To meet their water demand in 2025, these countries need to increase storage and transportation facilities to increase water supply by 25% or more from 1995. It is estimated that there will be a global water shortage by 2025. Countries in North Africa and the Middle East, such as Pakistan, India, and northern China, will face severe water shortages.