【单选题】【消耗次数：1】
在风管穿过需要封闭的防火、防爆的墙体或楼板时，应设预埋管或防护套管，其钢板厚度不应小于（ ）mm风管与防护套管之间，应用不燃且对人体无危害的柔性材料封堵。
①
1.6
②
1.8
③
1.9
④
2
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相关题目
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安装在一般楼板处的套管，其顶部高出装饰地安装在一般楼板处的套管，其顶部高出装饰地20mm即可，而安装在卫生间及厨房内的套管其顶部应高出装饰地面（ ）mm?
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