Highway upgrading design firstly must survey the performance-weakening condition of present pavement to obtain pavement basis designing parameters.
公路改扩建设计首先要对现有路面性能的衰减状况进行调查，以获取路面的基础设计参数。
Highway upgrading design firstly must survey the performance-weakening condition of present pavement to obtain pavement basis designing parameters.
公路改扩建设计首先要对现有路面性能的衰减状况进行调查，以获取路面的基础设计参数。
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