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1.If insufficient, backfill thickness must be: 1.不足承载力时回填厚度至少:
2.Compaction coefficient requirement is: 2.夯实系数要求为:
3.Excavations deeper than 1.5m must: 3.深度超过1.5m基坑必须:
4.High groundwater areas require: 4.高地下水区域必须:
5.After excavation, must clean: 5.开挖后必须清理:
6.First step in underground installation is: 6.地下安装标准流程第一步是:
7.Correct pipeline installation sequence is: 7.标准施工流程正确顺序是:
8.Base layer material is usually: 8.垫层材料一般为:
9.Base layer thickness is: 9.垫层厚度为:
10.Pipe lifting must use: 10.吊装管道时必须使用:
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