A double flexible metallic O-Ring seat provides a (1) static and (2) dynamic seal and assures compliance to fire-safe specifications.
双重柔性金属O形环阀座具有静止和动态密封性能，确保符合防火规则要求。
2
Malik said homeowners everywhere should take steps to make sure their roofs are reinforced, their Windows and doors are secure and their buildings have a fire-safe zone around them, he said.
马里克建议各地居民应该采取措施，确保房顶加固，门窗牢固，以及房屋周围有防火区。
3
However, fire officers have said a complete inventory of the damage will not be possible until the cathedral structure has been deemed safe.