Through the analysis of the origin of the Chi System, the author has also obtained that the semi-diameter of the celestial sphere is about 13 meters.
通过对尺寸系统起源的分析，认为古人裸眼目视观测时的天球半径约为13米上下。
2
Main technical factors of super-critical fluid extraction of Maoming and Fushun oil shale were studied in a semi-continuous experimental apparatus with an extractor 25 mm in diameter.