超声波方向性好，穿透能力强，能够传递信息，易于获得较集中的声能，在水中传播距离远。
一种采用超声波原理治疗白癜风的治疗仪。
An ultrasonic apparatus for treating leukoderma is disclosed.
目前常用的基于漏磁原理的裂纹检测和基于超声波原理的裂纹检测是在役管道检测主要的研究方向。
At present based on the current common principles were magnetic ultrasonic flaw detection and based on the principles of service flaw detection in the detection major research direction.
接着分析了超声波电动机的工作原理和定子表面质点椭圆运动的形成机理。
Then how USM works and how the ellipse trace of particle on the surface of stator forms are analyzed.
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