The acoustical properties and specific heat of sample at low temperatures were studied, and the temperature dependences of modulus, sound attenuation and specific heat were obtained.
对其低温的声学和比热容性质进行了研究，得到了样品模量和声衰减以及随温度变化的规律。
Objective: To research the acoustical quality of gastrointestinal contents and the attenuation criterion of ultrasound passing through gastrointestinal contents.
目的：探索胃肠内容物的声学特性及超声波经过胃肠内容物的衰减规律。
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