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| 导航系统的差分修正 | |||
| 局部校正; 微分校正 | |||
| 差分修正; 微分改正 | |||
| 较差改正; 差动修正 | |||
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differential correction : 12 phrases in 4 subjects |
| Air defense | 3 |
| Oil / petroleum | 2 |
| Space | 5 |
| Technology | 2 |
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