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| 11. | Quaternary Chronology |
| 第四纪年代学 |
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| 12. | quaternary number system |
| 四进制数系 |
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| 13. | quaternary alkylphosphonium salt |
| 季盐|四烷基膦盐 |
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| 14. | quaternary geology |
| 第四纪地质学 |
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| 15. | Quaternary Geology and Quaternary Environment |
| 第四纪地质与第四纪环境 |
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| 16. | quaternary vein |
| 四级脉 |
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| 17. | quaternary signal |
| 四元信号 |
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| 18. | quaternary compound |
| 季化合物； 四元化合物 |
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| 19. | quaternary steel |
| 四元合金钢 |
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| 20. | quaternary signaling |
| 四元通信 |
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