<正>润湿性表征胶粘剂与木质材料接触时在木质材料表面上粘附、渗透及铺展的难易程度和效果。笔者根据木质材料的结构与性能特点，建立了描述其表面动态润湿性能的数学模型，在模型中提出了用系数K来评价材料的润湿性能。运用该模型对异氰酸酯MDI和脲醛树脂UF在中密度稻草板MDSB表面的润湿性能进行了研究，得出MDI的K值较大，MDI在中密度稻草板表面的润湿性能较好。

The automatic classification of land use was carried out on the basis of Landsat ETM+ (TM) sensed data of two different periods in this paper. The extraction of land use information by different change detecting techniques was discussed. The results of the test region showed that the spectral variation method based on fusion data is the best. In the fusion image, the least width of the new linear land use type is 9.8m, and the least area of the new plane type is about 1000m2. The fusing image can be used as guiding data in land use dynamic monitoring.