当屋面防水等级为Ⅰ级、Ⅱ级时，不宜采用______屋而。
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When Mark went to Tom after the game, _______.
A. Tom said nothing to Mark.
B. Tom was too angry to talk to Mark.
C. Mark couldn't think of any words to say to Tom.
D. Mark said he didn't want to play against Tom's team again.
屋面防水设计，高聚物改性沥青防水涂料，用于Ⅳ级防水设防，其厚度不应小于______mm。
A. 1.0
B. 1.5
C. 1.8
D. 2.0
波形瓦、压型钢板檐口挑出的长度不小于______mm。
A. 50
B. 100
C. 150
D. 200
处于冻土层中的混凝土结构，其混凝土抗冻融循环不得少于______次。
A. 100
B. 90
C. 80
D. 70
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