英文字典中文字典


英文字典中文字典51ZiDian.com



中文字典辞典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z       







请输入英文单字,中文词皆可:



安装中文字典英文字典查询工具!


中文字典英文字典工具:
选择颜色:
输入中英文单字

































































英文字典中文字典相关资料:


  • Backflow Prevention - Marietta, GA
    Only an active back-flow prevention program can reduce the likelihood of such an occurrence In order to serve and protect its customers and to comply with state and federal regulation, Marietta Water controls and eliminates possible cross connections in the system
  • Backflow - Wikipedia
    Backflow is a term in plumbing for an unwanted flow of water in the reverse direction [1] It can be a serious health risk for the contamination of potable water supplies with foul water In the most obvious case, a toilet flush cistern and its water supply must be isolated from the toilet bowl
  • Backflow Prevention - Cobb County, Georgia
    What is backflow prevention? It is the prevention of reverse flow in a water system from the normal or intended direction What can cause something like this to happen?
  • What Is a Backflow Preventer? (And Do You Need One?)
    A backflow preventer is a device that ensures water flows in only one direction, preventing contaminated water from reversing into your clean supply Installed directly in your plumbing line, it uses one-way valves or vacuums to block backflow
  • Backflow Testing 101: What is It and Why Does It Matter?
    Backflow is water that flows from a service point – a consumer building, irrigation, or fire system – to the municipal water system Backflow has the potential to introduce hazards such as chemicals, medical waste, or debris into the local water supply
  • Backflow Preventer Types - NFPA
    Backflow preventers are installed to prevent contaminants from traveling from the non-potable source to the potable public drinking supply via back siphonage and back pressure Back siphonage is backflow caused by a negative pressure in the supply piping This negative pressure in the supply piping is similar to drinking water through a straw
  • What is Backflow in Plumbing? What Homeowners Need to Know
    Backflow occurs when the normal flow of water in a plumbing system is reversed, allowing non-potable (contaminated) water to enter the clean water supply This can introduce harmful bacteria, chemicals, and other pollutants into the water you use for drinking, cooking, and bathing
  • Backflow 101: A Beginners Guide to Understanding the Basics of . . .
    Unlock the secrets of backflow prevention with our beginner's guide Understand the risks of contaminated water, the role of the backflow preventer, and why regular maintenance, including an annual test, is crucial
  • What is Backflow Why Does it Matter? | ABP Backflow Services
    Backflow 101: What is a backflow and why does it matter? Water flows from the source to your tap in pressurized water pipes in one direction when everything is working correctly But in certain circumstances it can flow in the opposite direction which is commonly referred to as “backflow ”
  • Backflow Education - Watts
    Backflow is the unwanted reverse flow of fluids, gases, or other substances in a plumbing system due to a backpressure or a backsiphonage situation Backflow is not only a threat to the health of our community, it can also cause damage to our environment





中文字典-英文字典  2005-2009