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+# 二维零件图查错结果
+
+## 1. 格式错误
+
+来源：DWG 结构化抽取后的程序化规则判定；本节不使用 AI 判定。
+结论：发现 3 条确定问题。
+
+- center lines and axis lines：应为 thin center/dash-dot line，发现 2 条问题。
+  - handle=336, layer=粗实线层, linetype=Continuous, lineweight=-1：This line class should use a thin center/dash-dot style, but it looks like a coarse continuous line.
+  - handle=33B, layer=粗实线层, linetype=Continuous, lineweight=-1：This line class should use a thin center/dash-dot style, but it looks like a coarse continuous line.
+
+- missing thread root lines：应为 two inner thin continuous thread-root lines，发现 1 条问题。
+  - handle=13D|13E, layer=粗实线层, linetype=, lineweight=null：Probable screw/bolt axial contour pair is present, but the expected inner thread-root line pair was not found.
+
+说明：线型/线宽格式错误由程序直接使用 CAD 几何、实体类型、linetype、lineweight 和归属字段判定；标注错误和绘制表达错误仍由 AI 结合图片、结构化事实和知识库分析。
+
+## 2. 标注错误
+
+二维零件图标注错误仍需走 AI 分析；当前接口仅完成线型/线宽格式查错。
+
+## 3. 绘制错误
+
+二维零件图绘制表达错误仍需走 AI 分析；当前接口仅完成线型/线宽格式查错。