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| ★ 开环系统 | |||
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| 开路系统 | |||
| 开环控制系统 | |||
| 开环控制系统 | |||
| 开口回路 | |||
| 开环系统 | |||
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open-loop system : 15 phrases in 11 subjects |
| Air defense | 1 |
| Automated equipment | 1 |
| Automobiles | 1 |
| Electric machinery | 1 |
| Electricity | 1 |
| Electronics | 3 |
| Engineering geology | 1 |
| Information technology | 1 |
| Mathematics | 1 |
| Space | 3 |
| Technology | 1 |