Metal stairs shall be supported from structural steel framing, concrete walls, and concrete slab or footings.

钢结构支撑金属楼梯，混凝土墙和板坯或者基脚。

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Metal stairs shall be supported from structural steel framing, concrete walls, and concrete slab or footings.

钢结构支撑金属楼梯，混凝土墙和板坯或者基脚。

youdao