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| 联锁回路; 保持电路; 自保电路; 自保持电路; 联锁电路; 连锁电路 | |||
| 保险电路; 闭塞电路; 闭锁电路 | |||
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цепь блокировки : 2 phrases in 2 subjects |
| Electricity | 1 |
| Oil processing plants | 1 |
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