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| 国家电码 | |||
| 全国电气规程 | |||
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| 国家电业规程; 国家电气法典美 | |||
| 美国家电气代码 | |||
| 国家电气规程 | |||
| 国家电气法规 | |||
| 国家电气代码 | |||
| 国家电力规范 | |||
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| 美国国家电气规程 | |||
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| 国家电工规范印度，美国 | |||
| English thesaurus | |||
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| NEC | |||
| NEC (safety standard) | |||
| NEC (USA) | |||
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national electrical code : 11 phrases in 6 subjects |
| Aviation | 2 |
| Electronics | 4 |
| Environment | 2 |
| General | 1 |
| Technology | 1 |
| Textile industry | 1 |
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