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| search procedures | |||
| retrieval procedure; retrieval program | |||
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检索程序 : 20 phrases in 7 subjects |
| Aviation | 2 |
| Earth sciences | 2 |
| Electronics | 6 |
| Geology | 2 |
| Technology | 3 |
| Telecommunications | 3 |
| Textile industry | 2 |
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