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带有键值管道的 ngFor:类型“未知”不可分配给类型“NgIterable<any>”

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{
  "2021-11-22": [
    {
      "id": 1,
      "standard_id": 2,
      "user_id": 4,
      "subject_id": 1,
      "exam_date": "2021-11-22",
      "start_time": "09:45:00",
      "end_time": "02:52:00",
      "description": "kjhkjhkjhkjhkj\n\n\njgfhgfhgfghfghfhg",
      "deleted_at": null,
      "created_at": "2021-11-22T03:47:34.000000Z",
      "updated_at": "2021-11-22T03:47:34.000000Z",
      "subject": {
        "id": 1,
        "standard_id": 2,
        "name": "engilsh",
        "deleted_at": null,
        "created_at": "2021-11-21T07:11:15.000000Z",
        "updated_at": "2021-11-21T07:11:15.000000Z"
      }
    },
    {
      "id": 2,
      "standard_id": 2,
      "user_id": 4,
      "subject_id": 2,
      "exam_date": "2021-11-22",
      "start_time": "09:45:00",
      "end_time": "10:45:00",
      "description": "kjhkjhkjhkjhkj\n\n\njgfhgfhgfghfghfhg",
      "deleted_at": null,
      "created_at": "2021-11-22T03:49:41.000000Z",
      "updated_at": "2021-11-22T03:49:41.000000Z",
      "subject": {
        "id": 2,
        "standard_id": 2,
        "name": "Physics",
        "deleted_at": null,
        "created_at": "2021-11-21T07:17:25.000000Z",
        "updated_at": "2021-11-21T07:17:25.000000Z" …
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ngfor angular

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