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| 开-关两位阀 | |||
| 通-断两双位阀 | |||
| 双位阀; 转换阀 | |||
| 开关阀; 开闭阀 | |||
| 换向阀; 离合阀 | |||
| on- off valve: 1 phrase in 1 subject |
| Steel production | 1 |
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