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        {
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        {
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        },
        {
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        {
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        {
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        {
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          "difficulty": 1
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        {
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        {
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        {
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        {
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          "bank": "foundation",
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        {
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        {
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        {
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        {
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        {
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        {
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        {
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        {
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        {
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        {
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        {
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        {
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        {
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        {
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        {
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        {
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        {
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        {
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          "bank": "foundation",
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        {
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        {
          "id": "CHEM-KP02-060",
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    },
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    {
      "id": "SZ-JH-CHEM-G9-0205",
      "subject": "化学",
      "grade": 9,
      "semester": "下",
      "title": "铝表面氧化膜与耐腐蚀性",
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