下部导向轮架(自动扶梯)
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lower tension carriage 下部拉紧装置
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The bridge structure is formed by the inside and outside arc end carriage and the upper and lower retractable main girder, with compact structure, light weight and beautiful and dignified appearance.
内外弧形端梁与上下层伸缩式主梁构成的桥架结构紧凑，重量轻巧，美观实用。
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