超声波是指频率超过()的声波 Ultrasound refers to sound waves with a frequency exceeding ()

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超声波是指频率超过()的声波 Ultrasound refers to sound waves with a frequency exceeding ()

A.10kHz

B.20kHz

C.10MHz

D.20MHz

超声波是指频率超过()的声波 Ultrasound refers to sound waves with a frequency exceeding ()

热搜:人耳能够听到声呐发出的声波的频率范围是