however, its harmful effect to the atmospheric ozone layer has been deeply concerned by the international society. much research works have been done to seek for the substitutes of them.
但其对大气臭氧层的破坏作用,已引起了国际社会的高度重视,各国对其替代产品的研究做了大量的工作。
the basic principle of atmospheric ozone layer destruction hy polyurethane blowing agent cfc-11, and various way, developmental trend and economic feature of substitution for cfc-11 were reviewed.