However, backflow may now be creating other side effects.不过, 眼下回流可能正在引发其它一些负面影响.From this causes two backflow agitation efficiency not high substantial clause.由此引起二次回流搅动效率不高的重要原因.Backflow preventer manufactured from 300 ...
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.Backflow preventer manufactured from 300 Series stainless steel for corrosion resistance.防回流阀采用耐腐蚀的300系列不锈钢制造.However, backflow may now ...