The rice varieties with strong root system, large active absorption root surface and total root surface area had strong tolerance to copper poison.

根系发达、根系活跃吸收表面积及总吸收表面积大的品种，有较强的耐铜毒性。

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The system is introduced in three aspects, the introduction of adaptive and active sound absorption principle, hardware design and the results of experiments.

本文通过自适应有源吸声原理的介绍、系统的软硬件设计以及系统实验结果的讨论等三方面内容来介绍本系统。

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The active noise control technology and adaptive control technology were combined together in the paper, the adaptive and active broadband sound absorption system was designed.

本论文将有源噪声控制技术与自适应控制技术相结合，设计了自适应有源宽带吸声系统。

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