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| 脱扣〔吊牌〕继电器 | |||
| 跌落报警器; 跌落继电器 | |||
| 吊牌继电器; 脱扣继电器 | |||
| drop relay: 6 phrases in 4 subjects |
| Construction | 1 |
| Hydroelectric power stations | 1 |
| Plastics | 1 |
| Technology | 3 |
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