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| 主控号码 | |||
| 索引信息组; 键标字段; 关键字段 | |||
| 关键域 | |||
| 关键字域 | |||
| 键码字段 | |||
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| 关键码字段; 键码段 | |||
| key field: 3 phrases in 1 subject |
| Information technology | 3 |
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