A.1000Hz
B.2000Hz
C.4000Hz
D.6000Hz
E.8000Hz
[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]在听力曲线上呈V型下降最低的频率为A.1000HzB.2000HzC.3000HzD.4000HzE.5000Hz
[单选题,A2型题,A1/A2型题] 受噪声损害最早、最明显的听阈是()。A . 1000HzB . 2000HzC . 4000HzD . 6000HzE . 8000Hz
[单选题]受噪声损害最早、最明显的听阈是()A . 1000HzB . 2000HzC . 4000HzD . 6000HzE . 8000Hz
[单选题]干扰电疗法差频为A.0~1000HzB.0~100HzC.50~200HzD.0~50HzE.100~200Hz
[单选题]干扰电疗法其差频为A.0~1000HzB.0~100HzC.50~200HzD.0~50HzE.100~200Hz
[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]超声的声波频率应大于A.2000HzB.20000HzC.50000HzD.5000HzE.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]超声波是指声波频率高于多少的声波A.200HzB.2000HzC.20000kHzD.20000HzE.200000kHz