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基本参考系
| 统
| 基本参考系 | |
| tech. | fundamental reference system |
| 统 | |
| gen. | oneness |
| earth.sc. | system |
| geol. | series |
| oil | series |
| |||
| fundamental reference system | |||
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基本参考系 : 1 phrase in 1 subject |
| Electronics | 1 |
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