基金This work was supported by the National Natural Science Foundation of China (No. 30070421), the 10th Five Year Key Programs for Science and Technology Development of China (No. 2004BA525B02), 973 Program (No. 2004CB117201) and Cooperative Research between China and Korea (No. 2004-2007).
基金financially supported by the youth fund from the Guizhou Provincial Tobacco Company of China National Tobacco Corporation and the Standardization Project of Guizhou Province of China
