单选题:单位重量小于(  )g/m2的纸质、布质壁纸,当直接粘贴在A级基材上时,可作为B1级装修材料使用。

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题目内容:
单位重量小于(  )g/m2的纸质、布质壁纸,当直接粘贴在A级基材上时,可作为B1级装修材料使用。

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