concrete slab短语⁹⁶⁶⁷⁷⁺⁶ 基本例句 混凝土板 Her leg had been pinned beneath a heavy concrete slab. Two small cranes had failed to free her. 那个女孩的腿被一块沉重的水泥块压在下面，两台起重机都无能为力。 ecocn The field test is made about the tunnel invert that combined with precast reinforced concrete slab and dry concrete. 结果表明，由本文设计的隧道仰拱组合结构，能够增强隧道的施工安全和加快施工进度。 dictall