通过改变消声器的两腔容积比，可以改善消声器的有效消声频率范围。
Changing volume ratio of the two-chamber muffler can improve the effective noise reduction frequency range of the muffler.
实验证明，通过改变超声频率可实现对激光光束方向的控制。
Experiment showed control the direction of laser could be controlled by changing ultrasonic frequency.
实验证明，通过改变超声频率可实现对激光光束方向的控制。
Experiment showed control the direction of laser could be controlled by changing ultrasonic frequency.
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