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| 环形〔箱形〕天线 | |||
| 箱形环形天线 | |||
| 环形箱形天线 | |||
| 箱形天线 | |||
| 环形天线 | |||
| box loop: 5 phrases in 3 subjects |
| Metallurgy | 1 |
| Oil / petroleum | 2 |
| Technology | 2 |
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