A.2000Hz
B.20000Hz
C.50000Hz
D.5000Hz
E.10000Hz
[单选题]人耳可听到声波频率应小于A.2000HzB.20000HzC.50000HzD.5000HzE.10000Hz
[单选题]人耳能听到的声波频率为A.20~2000HzB.20~20000HzC.200~2000HzD.2000~20000HzE.20~200000Hz
[单选题]超声的声波频率应该大于以下哪项 ( )A.2000HzB.5000HzC.10000HzD.20000HzE.50000Hz
[单选题]人耳听觉范围内的声波频率应为A.50000HzB.20~20000HzC.5HzD.10HzE.80000Hz
[单选题]关于超声波的频率,下列哪项正确A.2000HzB.5000HzC.10000HzD.15000HzE.25000Hz
[单选题]超声波是一种机械波,频率超过A.10000HzB.20000HzC.30000HzD.40000HzE.50000Hz
[单选题]超声波是指声波频率高于多少的声波A.200HzB.2000HzC.20000kHzD.20000HzE.200000kHz
[单选题]音频的频率范围是A.20~2000HzB.27~2000HzC.2000~4000HzD.27~10000HzE.27~20000Hz
[单选题]超声波是人耳听不到的声波,其频率大于A.1000HzB.2000HzC.20kHzD.2MHzE.10kHz
[单选题]超声波的概念中,正确的是A.属于电磁波B.频率高于20000HzC.频率在16~20000HzD.治疗常用频率为800~3000HzE.频率为<16Hz