A. 对建筑物较多且分散的大测区,宜将控制点连同观测点按单一层次布设
B. 控制网应布设为闭合环、结点网等
C. 每一侧区水准基点最低不应少于3个
D. 作为工作基点的水准点位置与临近建筑物的距离不得小于建筑物基础深度的2倍
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