In the natural condition , the following five stages are the plant restoration and succession process of luota : populus adenopoda shrub forest , rhus chinensis , pyracantha fortweana shrub forest , liquidambar formosana , corizria sinica forest , pinus massoniana , carpinus rurczaninowii forest , karst evergreen - deciduous forest 只有少数林窗存在。自然恢复林在植被恢复程度上远不如喀斯特常绿落叶林，只在密闭的灌木丛中分布着少许高大的乔木。
Through improving and optimization the existing type , design a construction hoist that have big lift capacity , high lift height and good comprehensive operational perform , which type use the steel wire . its rate lift capacity is 4 tons , lift height is 100 meters . it is say about the overall performance , the applied prospect of this construction hoists would be well 本课题所设计的新型施工升降机是在现有机型的基础上通过优化和改进设计出的一台起重量大、提升高度高、综合使用性能好的施工升降机,其提升形式采用钢丝绳式,额定起重量为4吨,提升高度为100米,综合性能上远优于原有产品。
Pointed to rubbing composites from the early stage , organic asbestos series materials go up development to organic non - asbestos materials and inorganic monmetal basic materials , but the metal basic rubbing composites is far better than organic mecroniolecule basic rubbing composite in the strengts , resistance to temperture , resistance to wear , that is development trends of rubbing composites in the future 指出摩擦复材已由早期有机石棉系材料升级发展到有机非石棉系材料和无机金属基材料，而金属基摩擦复材在强度、耐温和耐磨耗性能上远优于有机高分子基摩擦复材，为摩擦复材的未来发展趋势。
