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| 电器步进式调节调速,控制器 | |||
| 步进控制器 | |||
| 分级控制器 | |||
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step controller : 8 phrases in 6 subjects |
| Electronics | 1 |
| Metallurgy | 1 |
| Plastics | 1 |
| Refrigeration | 1 |
| Space | 2 |
| Technology | 2 |
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