GB 917.2—2000.Mark rules of highway route—Name and number of national trunk highway. 1范围 GB 917.2规定了...
GB 917.2—2000 公路路线标识规则国道名称和编号
GB 917.2—2000.Mark rules of highway route—Name and number of national trunk highway. 1范围 GB 917.2规定了...