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Results The ultrasonic examination of tuberculosis hydrothorax showed that hydrothorax in thoracic cavity had no echo zone with clear sound transparent;pleura was thickened uniformly;opaque dark area of fluid had no parenchymatous phyma.Ultrasonic examination of cancerous hydrothorax showed that hydrothorax in thoracic cavity had no echo zone filled with full of thin light spots;sound transparent was not very clear;pleura showed uniform thickening;opaque dark area of fluid had parenchymatous uniform phyma.

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Integrating the sound intensity vector on the area which surrounds a sound source gets the sound power of this sound source. Since the integral of the sound power of the sound sources which are not enclosed by the area is zero, one could measure the sound power in ordinary environments correctly by measuring sound intensity.

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Sound intensity is defined as the sound power per area in the process of the sound wave promulgation. Its direction is the same as the direction of sound wave promulgation.

聲強(qiáng)的定義為聲波傳播過程中空間單位面積上傳輸?shù)穆暪β使谙哒嫒耸悠得夥眩闹赶蚴锹晜鞑サ姆较颉?/p>

For the exposed area of spatial sound absorbent in sound field is large and taises the sound absorption performance per unit area, it is possible to minimize the area for sound absorption treatment and gain better sound absorption effect.

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