Rc slab culvert, circular culvert and alloy steel corrugated culvert are applicable to the secular frozen earth area.

钢筋混凝土盖板涵、圆管涵和合金钢波管涵等都适应于多年冻土地区。

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Rc slab culvert, circular culvert and alloy steel corrugated culvert are applicable to the secular frozen earth area.

钢筋混凝土盖板涵、圆管涵和合金钢波管涵等都适应于多年冻土地区。

youdao