色综合久久青青草_日韩无码岛国AV_国产在线播放一区二区日韩_亚洲AV无码国产精品网红_亚洲精品国产aV成拍色拍婷

High temperature resistant material refers to the material that can withstand certain stress under the temperature above 550 ° C and has the ability of oxidation resistance and thermal corrosion resistance. Such material is widely used and often used in some high-temperature fields such as engine, rocket engine, aircraft, rocket tail and boiler. It is a very practical material. Of course, it has also been widely used.