The north-seeking instrument can be well integrated with the bearing and attitude to serve all army chariot and missile launch system with its high practical value.
Naqqara, a film-ringing percussion instrument, is widely distributed and used in many countries and areas, bearing musical culture features of different places.
纳格拉鼓，膜鸣打击乐器，广泛地分布、使用于许多国家和地区，展现着各地不同的音乐文化特征。
3
A scheme for autonomous control of aerostatic bearing used in large-sized photoelectric precision instrument is proposed.