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| 天线的回旋射束 | |||
| 旋转射束; 回旋射束 | |||
| rotating beam: 12 phrases in 6 subjects |
| Automobiles | 1 |
| Earth sciences | 1 |
| Information technology | 1 |
| Metallurgy | 3 |
| Space | 1 |
| Technology | 5 |
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