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| 正作用阀; 直动式阀; 正向调节阀 | |||
| 直接作用阀; 直接作用活门; 单级阀 | |||
| клапан прямого действия: 4 phrases in 3 subjects |
| Oil / petroleum | 1 |
| Oilfields | 2 |
| Technology | 1 |
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