A. 发生地面沉降的区域，仅存在一处沉降中心
B. 发生地面沉降的区域，必然存在厚层第四纪堆积物
C. 在大范围、密集的高层建筑区域内，严格控制建筑容积率是防治地面沉降的有效措施
D. 对含水层进行回灌后，沉降了的地面基本上就能完全复原
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