To multilayer acoustical panel, the complex transmission coefficients of multilayer both forward and backward incidences are definitely the same.
对多层均匀介质板，正、反两方向上的正入射复透射系数相同。
In the oil - well monitoring system, the data transmission method using acoustical waves as carrier waves via the wall of oil pipeline can bring cost savings and reliability.
在油井监测系统中，以油管管壁作为信道的声波通信方法可以降低成本和提高可靠性。
The acoustical and communications engineer is concerned with the generation, transmission and absorption of sound.
声学和通信工程人员研究的问题涉及声音的产生、传播和吸收等。
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