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| 参考书 | |||
| 手册 | |||
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| 手册 | |||
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hand book : 10 phrases in 7 subjects |
| Aviation | 1 |
| Bridge construction | 1 |
| Business | 1 |
| Economy | 2 |
| International trade | 1 |
| Labor law | 1 |
| Textile industry | 3 |
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