This article analyses the technology process of the left/right side plate of instrument cover of wheeled tractor, introduces the working principle and design requirements of the drawing dies, and points out that some cover parts are also stamped by means of simple and practical technology.

Application of Sevoflurane Inhalation Anesthesia by Mask in Children Undertaking Lacrimal Passage Probing;

In this article,the author tries to analyze some skills in singing,such as,the resonance of head cavity,mask resounding,the throat-opening,breath-supporting and pronunciation,in order to overcome some difficulties of getting pure and beautiful tone color.