graded stone upper base course
Dry River Valley of Minjiang’s Upper Course
Asphalt mixtures base course
Asphalt stabilized base course
Asphalt treated base course
Base course
道路基层
路面基层
底基层
路基层
主航向
基层
路面下层
承重层
勒脚层
水泥粉煤灰稳定碎石
底层
垫层
base course for pavement
base course of cement stabilized sand
Base Course of Pavement
Base course slope section
base course type coefficient