基层材料 meaning in English

subbase course material

Discussion on mcuterial of cement concrete pavements
关于水泥混凝土路面基层材料的探讨
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
Application of gangue as base course material of pavement for highways
煤矸石作路面基层材料的探讨
Optimal combination of compacting machineries on semi - rigid base material
半刚性基层材料的碾压机械优化组合
Study on the basecourse of phosphogypsum , lime and fly - ash stabilizing manganous slag
磷石膏二灰稳定锰渣基层材料的研究

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