次为美国土木工程的相关标准，借助于此我们可以了解美国土木界的相关技术规范-Time for the United States civil engineering related standards, with the aid of this we can understand the U.S. civil sector related technical specifications

改文件为美国土木工程协会制定的关于土木行业的标准。可以对现有国内的关于土木行业的工程计算提供参考-For the United States to file civil engineering association about civil industry formulated the standard. To the existing domestic about civil industry to provide reference for the engineering calculat