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| 注人头 (使钻液注人钻杆的水龙头接箍) | |||
| 喷头 | |||
| 注入头 (使钻液注入钻杆的水龙头接箍) | |||
| injection head: 11 phrases in 4 subjects |
| Electronics | 7 |
| Oil / petroleum | 1 |
| Space | 1 |
| Technology | 2 |
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