选用屋面防水等级为Ⅰ级的卷材时,合成高分子卷材和高聚物改性沥青卷材的每道厚度分别

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问题 选用屋面防水等级为Ⅰ级的卷材时,合成高分子卷材和高聚物改性沥青卷材的每道厚度分别不应小于多少?(  )A.1.5mm,4mmB.1.5mm,3mmC.1.2mm,4mmD.1.2mm,3mm

选项 A.1.5mm,4mm
B.1.5mm,3mm
C.1.2mm,4mm
D.1.2mm,3mm

答案 D

解析
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