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| 缓释继电器 | |||
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| 缓放继电器 | |||
| 缓放时间; 缓释断电器 | |||
| 缓释继电器 | |||
| slow-release relay: 8 phrases in 4 subjects |
| Communications | 1 |
| Electronics | 2 |
| Hydroelectric power stations | 2 |
| Technology | 3 |
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