A.20000Hz
B.1000000Hz
C.1MHz
D.0.1Hz
E.20MHz
[单选题]哪一频率不在超声的频率范围A.10000HzB.1000000HzC.1MHzD.0.1MHzE.20MHz
[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
[单选题]人耳对声波最敏感的频率范围是 ( )A.20~20000HzB.500~2000HzC.1000~3000HzD.125~8000HzE.8000~18000Hz
[单选题]超声的声波频率应大于A.2000HzB.20000HzC.50000HzD.5000HzE.10000Hz
[单选题]哪一频率不在超声的频率范围()A.10000HzB.1000000HzC.1MHzD.0.1MHzE.20MHz
[单选题]哪一频率不在超声的频率范围()A.10000HzB.1000000HzC.1MHzD.0.1MHzE.20MHz
[单选题]哪一频率不在超声的频率范围A .10000HzB .1000,000HzC .1MHzD .0.1HzE .20MHz
[单选题]哪一频率不在超声的频率范围A.10000HzB.1000000HzC.1MHzD.0.1MHzE.20MHz
[单选题]哪一频率不在超声的频率范围()A.10000HzB.1000000HzC.1MHzD.0.1MHzE.20MHz
[单选题]哪一频率不在超声的频率范围()A.10000HzB.1000000HzC.1MHzD.0.1MHzE.20MHz