{"ok":true,"question":{"id":21010,"question_uuid":"3e318a3b-fbee-4f74-a97a-1749ab0640dc","job_id":4,"source_file":"A中考/2026江苏中考期末数学试卷+答案820.pdf","source_page_start":6,"source_page_end":7,"source_bbox":"[30.0, 603.54, 557.04, 182.44]","subject_code":"math","grade_level":"JUNIOR","tree_code":"KT_JUNIOR_MATH_STANDARD","question_type":"single_choice","canonical_json":"{\"year\": null, \"blocks\": [{\"text\": \"如图所示, AB是圆O的直径, PA切圆O于点A, PO交圆O于点C, 连接BC,若∠P = 18∘, 则∠B等于 ( ). 2026-06-22\", \"type\": \"text\"}, {\"kind\": \"embedded_image\", \"type\": \"figure\", \"width\": 708, \"height\": 427, \"sha256\": \"299b9dd515c6e040072635e57e616fba3e09b9e7a6ab32559ca57690fbad2a15\", \"caption\": \"\", \"asset_key\": \"math/2026/09/16de2e24-a616-456b-83c5-3364ab6bd928/3e318a3b-fbee-4f74-a97a-1749ab0640dc/299b9dd515c6.png\", \"public_url\": \"http://tikupdfpng.mtwlkj.net:5129/qbank/math/2026/09/16de2e24-a616-456b-83c5-3364ab6bd928/3e318a3b-fbee-4f74-a97a-1749ab0640dc/299b9dd515c6.png\", \"source_bbox\": 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\"page_end\": 7, \"page_start\": 6, \"section_label\": \"智适化匹配练习   ★ 交互式系统学习\", \"answer_regions\": [], \"answer_original\": \"\", \"solution_original\": \"\"}, \"version\": 1, \"grade_level\": \"JUNIOR\", \"number_label\": \"1\", \"subject_code\": \"math\", \"question_type\": \"single_choice\", \"content_sha256\": \"c61f37f6e768826ed5ae8590ec29be4e6241ce8998aad8332d612b4ad990eca1\"}","body_html":"<div>如图所示, AB是圆O的直径, PA切圆O于点A, PO交圆O于点C, 连接BC,若∠P = 18∘, 则∠B等于 ( ). 2026-06-22<img class=\"question-figure\" src=\"http://tikupdfpng.mtwlkj.net:5129/qbank/math/2026/09/16de2e24-a616-456b-83c5-3364ab6bd928/3e318a3b-fbee-4f74-a97a-1749ab0640dc/299b9dd515c6.png\" style=\"width:188.9px!important;max-width:100%;height:auto\" alt=\"\" title=\"点击查看原图\"><br>A. 36∘<br>B. 30∘<br>C. 27∘<br>D. 45∘</div>","answer_html":"","ways_html":"","explain_html":null,"difficulty":2,"score":null,"year":null,"parse_status":"PARSED","qa_status":"QUARANTINED","retry_count":0,"final_score":0.712,"error_message":"QA 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( ). 2026-06-22 [图] A. 36∘ B. 30∘ C. 27∘ D. 45∘","result_json":"{\"ok\": true, \"rule\": \"clean-override\", \"issues\": [], \"confidence\": 0.9}","created_at":"2026-09-24T21:55:21"},{"id":413221,"import_question_id":21010,"audit_type":"FORMULA","auditor_name":"formula-auditor","status":"PASS","score":1.0,"input_snapshot":"","result_json":"{\"note\": \"无公式块\", \"checked\": 0}","created_at":"2026-09-24T21:55:21"},{"id":413222,"import_question_id":21010,"audit_type":"KNOWLEDGE","auditor_name":"knowledge-auditor","status":"WARN","score":0.0,"input_snapshot":"如图所示, AB是圆O的直径, PA切圆O于点A, PO交圆O于点C, 连接BC,若∠P = 18∘, 则∠B等于 ( ). 2026-06-22 [图] A. 36∘ B. 30∘ C. 27∘ D. 45∘","result_json":"{\"picks\": [], \"tree_code\": \"KT_JUNIOR_MATH_STANDARD\", \"candidates\": 0, \"classifier_version\": null}","created_at":"2026-09-24T21:55:21"},{"id":413283,"import_question_id":21010,"audit_type":"VISION","auditor_name":"vision-auditor","status":"WARN","score":0.2,"input_snapshot":"题干：\n如图所示, AB是圆O的直径, PA切圆O于点A, PO交圆O于点C, 连接BC,若∠P = 18∘, 则∠B等于 ( ). 2026-06-22 A. 36∘ B. 30∘ C. 27∘ D. 45∘\n答案：\n\n解析：\n","result_json":"{\"note\": \"视觉比对不可用\", \"error\": \"invalid_json\", \"unavailable\": true}","created_at":"2026-09-24T21:56:59"},{"id":413349,"import_question_id":21010,"audit_type":"SOLVER","auditor_name":"blind-solver","status":"PASS","score":0.9,"input_snapshot":"如图所示, AB是圆O的直径, PA切圆O于点A, PO交圆O于点C, 连接BC,若∠P = 18∘, 则∠B等于 ( ). 2026-06-22 [图] A. 36∘ B. 30∘ C. 27∘ D. 45∘","result_json":"{\"basis\": \"因为PA是圆O的切线，AB是直径，所以∠PAB = 90°。在△PAB中，∠P = 18°，所以∠B = 90° - 18° = 72°。又因为OB = OC（半径），所以△OBC是等腰三角形，∠OCB = ∠B = 72°。在△OBC中，∠BOC = 180° - 72° - 72° = 36°。而∠AOC = 180° - ∠BOC = 144°（平角）。在△AOC中，OA = OC（半径），所以∠OAC = ∠OCA = (180° - 144°)/2 = 18°。因此，∠B = ∠OBC = 27°（因为∠ABC = ∠ABO + ∠OBC，而∠ABO = 90° - ∠OAB = 90° - 18° = 72°，但更直接的是：注意到∠B指的是∠ABC，而通过圆周角与圆心角关系，∠ABC = 1/2 ∠AOC = 1/2 × 54° = 27°，其中∠AOC = 2×∠ABC）。\", \"answer\": \"C\", \"confidence\": 0.9, \"handout_chars\": 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