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backings
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背衬木
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详细解释：
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以下为句子列表：
英文: Based on our two-dimensional approximate theoretical analysis, a transfer function model of the acoustic characteristics of underwater anechoic coating with various backings is established on the low-frequency range.
中文: 摘要在吸声覆盖层水声声管测试的实验研究中，覆盖层背衬的选择对测量结果有重大影响。
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英文: The results show that the influences of various backings on the acoustic characteristics of anechoic coating are obviously different.
中文: 结果表明，不同背衬对吸声覆盖层吸声性能的影响具有明显不同的特性。
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