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| 节流嘴; 自喷油嘴; 阻流器 | |||
| 节流嘴 (choke); 自喷油嘴 (choke) | |||
| flow bean: 7 phrases in 3 subjects |
| Drilling | 3 |
| Oil / petroleum | 3 |
| Technology | 1 |
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