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脉冲时钟发生器 : 23 phrases in 8 subjects |
| Air defense | 1 |
| Automobiles | 2 |
| Electronics | 10 |
| Information technology | 1 |
| Metallurgy | 2 |
| Oil / petroleum | 2 |
| Technology | 3 |
| Telecommunications | 2 |
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