DrEcht

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1.	沉管隧道是德雷赫特河迄今在荷兰修建的最大沉管隧道是德雷赫特河（Drecht）隧道（图5），某外轮廓为48．8×8．08m，由4个双车道管孔和两个服务巷道组 … www.ccmetro.com\|Based on 2 pages

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AllAll,沉管隧道是德雷赫特河沉管隧道是德雷赫特河

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"It's a $3 billion market, " says Dr Echt.