A.1000Hz
B.2000Hz
C.3000Hz
D.4000Hz
E.5000Hz
[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]受噪声损害最早、最明显的听阈是A.1000HzB.2000HzC.4000HzD.6000HzE.8000Hz
[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]超声波是指声波频率高于多少的声波A.200HzB.2000HzC.20000kHzD.20000HzE.200000kHz
[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]设(DS)=3000H,(SS)=2000H,(BP)=1000H,指令NEG BYTE PTR[BP]中,操作数的物理地址是()。A . 40000HB . 31000HC . 30000HD . 21000H
[单选题]噪声所致听力曲线图上的V形下陷常发生在A.500~2000HzB.1000~3000HzC.2000~5000HzD.3000~6000HzE.4000~8000Hz
[单选题]通常所指的言语频率是A.250Hz以下B.500~2000HzC.2000~3000HzD.3000~4000HzE.4000Hz以上
[单选题]音频电疗法的频率范围为A.0~100HzB.100~1000HzC.1000~5000HzD.5000~10000HzE.10000~20000Hz