... have been widely applied to aviation, spaceflight, navigation, machine tool, wind turbine generator, metallurgy, petroleum, chemical, medical treatment, rail transport, automobile, ... of bearing assemblies for “Dong fang hong” series man-made satellite, manned spacecraft series from “Shenzhou 1” to “Shenzhou 7” ... Branch of Machinery Industry Professional Skill Appraisal Center wind turbine yaw bearing