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| 71. | alternative fever and chill |
| 寒热起伏 |
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| 72. | fluctuation data |
| 起伏数据 |
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| | |
| 73. | fluctuation echo |
| 起伏回波 |
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| | |
| 74. | Surge protectors. Type of surge protector can be specified. |
| 冲击电压保护器。可指定冲击电压保护器的类型。 |
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| 75. | undulating grade |
| 起伏坡度 |
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| 76. | a chain of undulating hills |
| 丘陵起伏 |
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| 77. | thermal fluctuation |
| 热起伏 |
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| 78. | available relief |
| 有效起伏 |
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| 79. | seasonal fluctuation |
| 季节性起伏 |
|
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| | |
| 80. | valve surge damper |
| 阀簧减震器 |
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| | |