{
  "kind": "合成样例，非现场测量",
  "id": "B08-N01",
  "input": [
    {
      "length": 2000,
      "scale": 0.001
    },
    {
      "length": 2000,
      "scale": 1
    },
    {
      "length": 2,
      "scale": 0.001
    }
  ],
  "expected": [
    {
      "meters": 2.0,
      "ratio": 1.0
    },
    {
      "meters": 2000,
      "ratio": 1000.0
    },
    {
      "meters": 0.002,
      "ratio": 0.001
    }
  ],
  "onsite_record": {
    "source_unit": "",
    "source_span": "",
    "export_unit": "",
    "root_scale": "",
    "parent_scale": "",
    "world_length_m": "",
    "reference_evidence": ""
  }
}