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| 复式阀; 多极管 | |||
| 多级阀门 | |||
| 复合电子管 | |||
| 多级管 | |||
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| 发动机多气门的 | |||
| multiple -valve: 20 phrases in 6 subjects |
| Automobiles | 4 |
| Construction | 1 |
| Metallurgy | 3 |
| Oil processing plants | 1 |
| Surgery | 1 |
| Technology | 10 |
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