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| frame of reference | |||
| reference frame | |||
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| reference frame | |||
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| frame of reference; reading system | |||
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| frame of reference | |||
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读数 系 统 : 17 phrases in 6 subjects |
| Aviation | 2 |
| Earth sciences | 1 |
| Electronics | 4 |
| General | 1 |
| Space | 3 |
| Technology | 6 |
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