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| 环形管线 | |||
| 环形管路 | |||
| 环形管道 | |||
| ring line: 9 phrases in 7 subjects |
| Air defense | 1 |
| Bridge construction | 1 |
| Electric machinery | 1 |
| Electronics | 1 |
| Information technology | 1 |
| Technology | 3 |
| Textile industry | 1 |
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