道路基层 meaning in Chinese

road base

The stability analysis on sandy gravel as road base
砂砾石作为道路基层的稳定性分析
The application of coal gangue used as road base material
煤矸石做道路基层材料的应用分析
Utilization of coal waste in road base
煤矸石在道路基层的试验研究
Laying roadbase of carriageway near the area 18 cemetery
邻近于东涌18区坟场铺设道路基层的工程
Code for construction and acceptance of road base of steel slag - lime stabilized materials
钢渣石灰类道路基层施工及验收规范

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