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定时器 定时脉冲 : 22 phrases in 11 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Computers | 1 |
| Construction | 1 |
| Electronics | 4 |
| Hydroelectric power stations | 1 |
| Information technology | 1 |
| Metallurgy | 2 |
| Military | 1 |
| Space | 3 |
| Technology | 6 |
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