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| 鼓式扫描; 鼓形扫描 | |||
| 滚筒扫描 | |||
| drum scanning: 10 phrases in 6 subjects |
| Agriculture | 1 |
| Air defense | 1 |
| Computers | 1 |
| Information technology | 2 |
| Technology | 3 |
| Telecommunications | 2 |
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