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| 手动门 | |||
| 手动操作阀 | |||
| 手控阀; 手动阀 (门) | |||
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| 手动阀; 手控阀 | |||
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hand-operated valve : 4 phrases in 3 subjects |
| Compressors | 1 |
| Refrigeration | 1 |
| Technology | 2 |
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