片语
pile-top cushion course桩顶垫层
cement stabilizing gravel-sand cushion course水泥稳定砂砾垫层
sand cushion course砂垫层
sand asphalt cushion course沥青砂垫层
penstock with cushion course垫层管
cushion course treatment垫层处理
asphalt cushion course地沥青垫层
cushion course detail软垫层