The technical measures and structure,applied principles of blastproof of ventilation shaft at excavating face,specific operational method and prospective effect are described.
A method to ascertain airtightness of regulable refrigeratory, airtightness material selection and a way to made air retaining wall were discussed in this paper.
Hua Tuo (Eastern Han Dynasty), developed the Wuqinxi ("Frolics of the Five Animals"), a series of physical exercises based on movements of the tiger, deer, bear, ape, and crane.