dredging tube 中文意思是什麼
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Dredging of an immersed tube tunnel trench to - 30mpd alongside the existing gravity structure seawalls would undermine the seawalls, the bases of which are around - 5mpd
現有的重力式結構海堤的地基在主水平基準面以下約5米,沿海堤挖掘沉管隧道坑道至主水平基準面以下30米會削弱這些海堤。
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