A . 2000Hz
B . 5000Hz
C . 10000Hz
D . 20000Hz
E . 50000Hz
[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]超声的声波频率应该大于以下哪项()A.2000HzB.5000HzC.10000HzD.20000HzE.50000Hz
[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]超声的声波频率应大于A.2000HzB.20000HzC.50000HzD.5000HzE.10000Hz
[单选题]超声的声波频率应大于:()A . 2000HzB . 5000HzC . 10000HzD . 20000Hz
[单选题]超声是频率大于()赫兹的声波。A . 2000B . 5000C . 10000D . 20000E . 15000
[单选题]超声是频率大于______赫兹的声波()A.2000B.5000C.10000D.20000E.15000
[单选题]超声是频率大于()赫兹的声波。A.2000B.5000C.10000D.20000
[单选题]超声波是指频率大于多少的声波()A . 1000HzB . 5000HzC . 10000HzD . 15000HzE . 20000Hz
[填空题] 超声波频率是大于_______赫兹。