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| 开关切换周期 | |||
| 转换周期; 开关操作循环; 开断周期; 切换循环 | |||
| switching cycle: 7 phrases in 5 subjects |
| Automobiles | 1 |
| Construction | 1 |
| Electronics | 2 |
| Technology | 2 |
| Telecommunications | 1 |
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