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| 61. | The results showed that instability of operation temperature and increase in space velocity and pressure would cause deterioration of the activity stability, resulting in shorter service cycle. |
| 结果表明，操作温度的不平稳、空速及压力的提高均会造成催化剂活性稳定性变差，运转周期缩短。 |
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| 62. | shortening of the melting period |
| 熔期缩短 |
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| 63. | curtail a speech, one's holidays |
| 缩短讲话、 假期 |
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| 64. | half-line period |
| 半行周期，横扫频率半周期 |
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| 65. | quasi-periodic oscillation |
| 拟周期波动;拟周期振荡 |
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| 66. | period staggering |
| 周期错调, 周期参差调谐 |
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| 67. | aperiodic circuit |
| 非周期电路|非周期振荡电路 |
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| 68. | daily burning cycle |
| 日火烧周期<24小时的燃烧周期 |
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| 69. | aperiodic damping |
| 非周期阻尼|非周期衰减 |
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| 70. | natural period of oscillation |
| 固有振动周期;自然回摆周期 |
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