A .15~20
B .20~25
C .25~30
D .30~35
[单选题]人耳所能听到的频率范围在()之间。A . 5~10000HzB . 10~12000HzC . 15~17000HzD . 20~20000Hz
[填空题] 人耳所能听到的频率范围在()Hz之间。
[单选题]标准正常人耳能听到的频率为A.20~20000HzB.10~10000HzC.10~100000HzD.50~50000HzE.10~50000Hz
[判断题]正常人刚刚能听到的最微弱声音的声压为20Pa,称为人耳的“听阈”。()A.对B.错
[判断题]正常人刚刚能听到的最微弱声音的声压为20Pa,称为人耳的“听阈”。()A.对B.错
[单选题]人耳能听到的声音频率范围是()。A.20~20KHZB.50~10KHZC.20~10KHZD.50~20KHZ
[单选题]人耳能听到的声音频率范围是()A.50~10KHZB.50~20KHZC.20~20KHZD.20~10KHZ
[单选题]正常人耳对声音频率的最敏感范围是A.20~20000 Hz B.100~6000 HzC.:1000~3000 Hz D.1000~10000 HzE.5000~20000 Hz
[单选题]正常人耳对声音频率的最敏感范围是A.20~20000HzB.100~6000HzC.1000~3000HzD.1000~10000HzE.5000~20000Hz
[单选题]标准正常人耳能听到的频率为A.20~20000HzB.10~10000HzC.10~100000HzD.50~50000HzE.10~50000Hz