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21. | double angle fomula |
| 倍角公式 |
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22. | double length word |
| 倍长字 |
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23. | double precision arithmetic |
| 倍精度运算 |
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24. | double density encoding |
| 倍密度编码 |
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25. | macro mechanism |
| 低倍机构 |
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26. | law of multiple proportions |
| 倍比定律 |
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27. | octave band oscillator |
| 倍带振荡器 |
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28. | double density diskette |
| 倍密度软磁盘 |
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29. | sodium sesquisilicate |
| 倍半硅酸钠 |
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30. | double voltage connection |
| 倍压联结 |
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