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| 周期性操作; 间隙操作 | |||
| 周期运行; 周期性运转; 定期运行 | |||
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| 周期运行; 周期性运转; 定期运行 | |||
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periodical operation : 5 phrases in 2 subjects |
| Electric machinery | 2 |
| Technology | 3 |
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