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【单选题】
4-22.本工程的水泥砂浆防潮层的做法()
A.
在防潮层位置抹一层20厚1：2水泥砂浆掺3％的防水剂
B.
在防潮层部位先抹20mm厚的砂浆找平层，然后干铺油毡一层或用热沥青粘贴一毡二油
C.
60mm厚的配筋细石混凝土防潮带
D.
在防潮层位置抹一层30mm厚1：3水泥砂浆掺5％的防水剂
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【简答题】【C1】______ nearly a hundred years of powered flight, scientists are still trying to figure out how birds fly. Researchers have learned that the slapping noise pigeons make when they suddenly take off ...
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