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| 环首螺栓 | |||
| 环首螺栓; 环形螺栓 (干船坞设备) | |||
| 环端螺栓; 带环螺栓 | |||
| ring bolt: 6 phrases in 3 subjects |
| Electric machinery | 1 |
| Technology | 3 |
| Textile industry | 2 |
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