项目部生产经理张xx针对于二号宿舍楼一层北段发生下沉的原因，进行了归纳和阐述：

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　　2、观察结果，形成书面资料并上报公司、教育局、力森劳务公司。

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• Avoid using hyphens or numbers.
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　　4、东区室内地沟、二次回填土结束；