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| direction finding set | |||
| direction finding device; goniometer system | |||
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测向装置 : 10 phrases in 7 subjects |
| Aviation | 1 |
| Business | 1 |
| Earth sciences | 2 |
| General | 2 |
| Space | 1 |
| Technology | 2 |
| Wind Energy | 1 |
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