Should a motorway pass under or over a large waterway? Up till about 1960 the only alternative was bridging over or tunnelling under the waterway.
Should a motorway pass under or over a large waterway? Up till about 1960 the only alternative was bridging over or tunnelling under the waterway.
公路应该从江河的下方还是上方通过？直到1960年左右所能选择的方案只是水上架桥法或水下开凿隧道法。