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1·An analytical model of air density derived from CIRA 1972 is presented in this paper.

本文导出了与CIRA 1972内符合精度较高的一种分析模型。

2·The working experience of CIRA has been more than ten years, which has got so much support by the leaders of government.

协会已积累了十多年的工作经验，三次被评为全国先进工业行业协会。