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71. | boron sesquioxide |
| 倍半氧化硼 |
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72. | cascade voltage doubler |
| 级联倍压器 |
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73. | swing amplitude |
| 摆幅|倍幅 |
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74. | inverse period-doubling bifurcatio |
| 倒倍周期分岔 |
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75. | demultiplication of frequency |
| 频率的倍减 |
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76. | low-expansion foam extinguishing agent |
| 低倍泡沫灭火剂 |
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77. | half as many again |
| 多半倍|一倍半 |
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78. | double-twist twist tube |
| 倍捻加捻管 |
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79. | conventional voltage doubler |
| 常用倍压电路 |
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80. | pulse voltage multiplier |
| 脉冲倍压发生器 |
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