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| 双母接头. | |||
| 双内螺纹接头 | |||
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box-box connection : 23 phrases in 10 subjects |
| Architecture | 1 |
| Automobiles | 1 |
| Drilling | 1 |
| Electric machinery | 1 |
| Electronics | 4 |
| Hydroelectric power stations | 2 |
| Metallurgy | 1 |
| Oil / petroleum | 2 |
| Space | 2 |
| Technology | 8 |
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