世界最长跨海大桥——港珠澳大桥主体工程贯通

8 Jul

7月7日,世界(world)最长跨海(cross-sea)大桥——港珠澳大桥主体工程贯通。全长约55公里的港珠澳大桥由桥、岛、隧三大部分组成,将于今年年底具备通车条件,届时珠海至香港(Hong Kong)车程将由3个半小时缩至半小时。海底隧道全长约6.7公里,最深处位于48米深的海底。它是国内(inland)首条外海沉管隧道,也是当今世界上最长、埋深最深、综合技术难度最高的沉管隧道。

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