超声波是一种()Ultrasound is a kind of()
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超声波是一种()Ultrasound is a kind of()
A.电磁波electromagnetic wave
B.机械波Mechanical wave
C.低频波Low frequency wave
D.电波Radio wave
参考答案:
超声波是一种()Ultrasound is a kind of()
A.电磁波electromagnetic wave
B.机械波Mechanical wave
C.低频波Low frequency wave
D.电波Radio wave
参考答案: