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| 美国农业化学公司 | |||
| 声衰减系数 | |||
| 吸音系数 | |||
| 吸声系数 | |||
| 声吸收系数 | |||
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| 吸声系数 | |||
| 声波吸收系数 | |||
| 声吸收系数 | |||
| 吸音系数 | |||
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acoustical absorption coefficient : 1 phrase in 1 subject |
| Plastics | 1 |
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