Standard specification for chemically modified asphalt cement for use in pavement construction 用于路面建造的化学改良沥青水泥的标准规范
2.
The comparison of the effect on the water propertles of alkaline - saline grassland between biological and chemical amel iorates 化学改良对重度盐碱化草地土壤水分特性影响的比较研究