A scientific and technological achievement in aviation materials has reached the overall international advanced level, with some leading international levels. A scientific and technological achievement in aviation materials has reached the overall international advanced level, with some leading international levels. A scientific and technological achievement in aviation materials has reached the overall international advanced level, with some leading international levels. A scientific and technological achievement in aviation materials has reached the overall international advanced level, with some leading international levels Part of the international leading level aviation materials have achieved an overall international advanced level, part of the international leading level aviation materials have achieved an overall international advanced level, part of the international leading level aviation materials have achieved an overall international advanced level, and part of the international leading level aviation materials have achieved an overall international advanced level and part of the international leading level