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| |||
| 正-负-内在的-正 | |||
| P 型-N型-本征型-P型结构 (structure) | |||
| positive-negative-intrinsic-positive: 15 phrases in 4 subjects |
| Air defense | 1 |
| Electronics | 10 |
| Space | 1 |
| Telecommunications | 3 |
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