回流

• Back siphonage backflow vacuum breakers
  倒虹吸回流真空关闭阀
• Laboratory faucet backflow preventer
  实验室旋塞防回流装置
• Experimental study of the range of circulating flow in dug - into basin
  内河挖入式港池回流范围的试验研究
• A checklist for returning emirgrants
  回流移民身份一览表
• For use with backflow preventer test cocks to protect from damage
  用于防回流阀测试旋塞，防止受到破坏。
• The system should be flushed before the backflow valve is installed
  在安装回流阀之前系统应该进行冲刷。
• A checklist for returning emigrants
  回流移民身份一览表
• Installing a backflow preventer in a pit or vault is not recommended
  不建议在坑内或拱顶内安装防回流阀。
• Especially made for testing all reduced pressure zone backflow preventers
  专用于检测所有减压区防回流阀。
• An experimental study on the separation of solid and liquid in waste mud
  侧沟式固液分离器强化污泥回流研究