单选：提高外墙保温能力可采用（）。A.选用热阻较大的材料作外墙；B.选用重量大的材料作外墙；C.选用孔隙率高、密度小（轻）的材料作外墙；D.防止外

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提高外墙保温能力可采用（）。A.选用热阻较大的材料作外墙；B.选用重量大的材料作外墙；C.选用孔隙率高、密度小（轻）的材料作外墙；D.防止外墙产生凝结水；E.防止外墙出现空气渗透。
A．ACD
B．ABE
C．BE
D．ABCDE

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