请回答一下如果要去大众定损中心定损和修车，需要准备哪些材料，并用json格式打印输出。
user
```json
{
  "requirements": [
    {"item": "车辆行驶证", "description": "需提供原件和复印件"},
    {"item": "车辆驾驶证", "description": "需提供原件和复印件"},
    {"item": "保险单", "description": "需提供原件和复印件"},
    {"item": "事故证明", "description": "如交警出具的事故责任认定书等"},
    {"item": "定损委托书", "description": "如需委托他人代办，需提供委托书及代办人身份证明"},
    {"item": "车主身份证明", "description": "需提供原件和复印件"},
    {"item": "维修预约单", "description": "如提前预约维修，需提供预约单"}
  ]
}
```
assistant