def to_dict(self) - Dict[str, Any]:
2. 无回填土压实报告及管网地基承载力报告。（违反《建筑地基基础工程施工质量验收标准》GB50202-2018第9.5.3条。）
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- assignment: Array of booleans. If the formula is satisfiable provide an assignment for each variable from 1 to N. If the formula is not satisfiable this field is null.
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