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1928年7月1日

1分钟阅读

巨大的铁路填方工程

最初的木制栈桥被取代，先是钢桥，然后是大型土方填筑

作者：J. 伯纳德·沃克

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More by J. Bernard Walker

This article was originally published with the title “A Mammoth Railroad Fill” in 大众科学 Magazine Vol. 139 No. 1 (July 1928), p. 20
doi:10.1038/scientificamerican0728-20

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