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| 电子管电路 | |||
| 真空管回路 | |||
| 循环回路; 蛇形管; 管道系统 | |||
| tube circuit: 8 phrases in 4 subjects |
| Air defense | 1 |
| Electronics | 2 |
| Metallurgy | 2 |
| Technology | 3 |
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