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| 柱形螺杆 | |||
| 弹子锁芯螺丝 | |||
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cylinder screw : 9 phrases in 5 subjects |
| Compressors | 1 |
| Hydroelectric power stations | 1 |
| Plastics | 4 |
| Port facilities | 1 |
| Technology | 2 |
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