摘要: The section of the handbook contains the National Standard Construction and Material Specifications to be used in contracts prepared by the Soil Conservation Service. There are three chapters in Section 20. Chapter 1 contains the ... 展开 The section of the handbook contains the National Standard Construction and Material Specifications to be used in contracts prepared by the Soil Conservation Service. There are three chapters in Section 20. Chapter 1 contains the general policy on use, content, and format. Chapter 2 contains the specifications dealing with construction operations work to be performed. Chapter 3 contains the specifications for materials used. References are made to various standards available for quality determinations and limits. 收起