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| 地面【井口】安全阀 | |||
| 地面安全阀; 井口安全阀; 井口安全闸门; 水面安全阀 | |||
| surface safety valve: 9 phrases in 4 subjects |
| Drilling | 1 |
| Mechanics | 2 |
| Mining | 2 |
| Oil / petroleum | 4 |
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