{
  "id": "cmtv9i9uk000fp307q3zf6tz8",
  "paper_id": "cmtv6kgza0005ql078xpn4ctk",
  "paper_name": "期中试卷",
  "question_id": "q1",
  "question_no": "1",
  "question_text": "菱形具有而平行四边形不一定具有的性质是\nA. 两组对边分别平行\nB. 两组对角分别相等\nC. 对角线互相平分\nD. 对角线互相垂直",
  "student_answer": "D",
  "score": null,
  "max_score": null,
  "status": "correct",
  "knowledge_points": [
    "菱形的性质",
    "平行四边形的性质"
  ],
  "error_tags": [],
  "evidence": [
    {
      "image_id": "cmtv9dtin0001p30728xintjq",
      "bbox": {
        "x": 0.08,
        "y": 0.19,
        "width": 0.3,
        "height": 0.08
      }
    },
    {
      "image_id": "cmtv9dtin0001p30728xintjq",
      "bbox": {
        "x": 0.0863,
        "y": 0.1942,
        "width": 0.259,
        "height": 0.0731
      }
    }
  ],
  "confidence": 0.95,
  "needs_review": false,
  "scoring_basis": "model",
  "version": 1
}