目的研究声强和频率对发声稳定性的影响。
Objective To investigate the effects of sound intensity and frequency on phonatory stability.
本文进一步分析了液体超声蒸发对超声声强和频率的要求。
Moreover, the requirements of the ultrasonic vaporation of liquid to ultrasonic intensity and frequency were introduced.
与简单形状目标相比，复杂目标的回声强度随频率和距离的变化更为复杂。
By comparison with simple shape targets, the echo strength of the complex targets versus frequency and range is more complex.
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