A. 在布置变形监测网的基准点、工作基点时，每个基坑工程至少应有3个稳定、可靠的点的基准点
B. 监测期间，应定期检查工作基点和基准点的稳定性
C. 对同一监测项目，可采用不同的观测方法和观测路线
D. 同一项目应在基本相同的环境和条件下工作
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