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| 分步系统 | |||
| 步进系统 | |||
| 步进制; 步进式系统; 步进方式 | |||
| 步进制交换系统 | |||
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| 步进系统 | |||
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step-by-step system : 8 phrases in 3 subjects |
| Communications | 1 |
| Technology | 6 |
| Telecommunications | 1 |
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