钢结构安装时，磨光顶紧的构件安装面边缘最大间隙不超过()。
A. 0.6mm
B. 0.8mm
C. 1mm
D. 1.2mm
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屋面卷材防水施工，平屋面的沟底水落差不得超过()。
A. 100mm
B. 200mm
C. 300mm
D. 400mm
防水混凝土结构厚度不应小于()，其允许偏差为+15mm、-10mm。
A. 300 mm
B. 280 mm
C. 320 mm
D. 250 mm
小砌块施工砌体水平灰缝的砂浆饱满度，按净面积计算不得低于()。
A. 80%
B. 85%
C. 90%
D. 95%
Richard Reid tried to bomb a plane with the bomb ______.
A. provided by terrorists
B. stolen from the military
C. made according to the methods shown in Internet
D. made in his lab
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