<正>以汽油机为研究对象，从发动机的功率、扭矩以及油耗率等外特性方面对添加了特殊性剂的M58甲醇汽油和90#无铅汽油进行了对比试验。通过试验发现，在发动机的中低转速下M58甲醇汽油具有良好的动力性，完全可以满足车辆正常行驶的需要。

An investigation of forest communities in various districts was conducted in Nanjing Forestry University. The results revealed that 91 families, 245 genuses, 603 species were recorded in this area. Compared with the investigation in 1952, 1976, 1982, the species were decreasing sharply in the campus. There were less species and simple structure in the plantation and the road greenbelt. The species diversity index for different strata of forest in NFU was in the order: herb＞shrub＞tree. The diameter ranges of the trees were between 8cm and 24cm. The strategies are proposed as follows: (1) to enrich the species diversity; (2) to refine the function of campus forest and integrate the ecosystem; (3) to exert the function of the community, keep healthy ecosystem; (4) to make campus forest accord with urban forest to establish a high-qualified manrpement system.