7HAO Jun-qing. 2004a. The study on protection and utilization of the Luochuan Loess National Geopark and interactive develop -ment with the local economy[D]. Xi'an: Shannxi Nomal University.
8NING Jian-xin. 2000. An adaptability analysis model of enterprise market: a new market environmental analysis matrix[J]. Commercial Research, (10) : 85-88.