单项选择题
A.1m B.2m C.5m D.10m
A.15km2 B.20km2 C.30km2 D.50km2
A.中庭 B.电梯井和管道井 C.变形缝 D.建筑幕墙
A.2mm B.10mm C.15mm D.20mm
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