Ceilings shall be constructed of a rigid, smooth faced, non absorbent material and washable.

天花板应采用坚固, 平整, 无吸附,可洗涤的材料.

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Ceilings shall be constructed of a rigid, smooth faced, non absorbent material and be washable.

天花板应采用坚固 、 平整 、 无吸附、可洗涤的材料.

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