摘要China is promoting environmentally friendly cars to save energy and protect the environment While people enjoy the pleasure and convenience of driving, they are also creating and breathing more and more
10Received date: 1999-11-12,Revised date: 2000-02-17 Foundation item: Under the auspices of the National Natural Science Foundation of China (No. 49731020) and key project of Chinese Academy of Sciences (No. KZ952-J1-220). WANG Qiang (Institute of Geogr.Land use and land cover change in Liaocheng Prefecture of China[J].Journal of Geographical Sciences,2000,10(3):13-20.
