The agro-environmental fragility of 31 provinces and regions (except Hong Kong,Macao and Taiwan) of our country during the years 1978-2004 is measured by adopti
Taking Shuangliu County,Chengdu City,China as an example,evaluation index system for the rights protection effects of farmland transfer is established contract
On the basis of introducing the fundamental principles of the least square methods, the Chebyshev polynomial data fitting method is given, by using this method,