钢中声速约为5900m/s,2.5MHz声波的波长约为()。
A.2.36mm
B.2.36cm
C.0.42mm
D.0.42cm
参考答案:A
---Would you please help me carry the suitcase?
---____________.
A.My pleasure
B.With pleasure
C.Go ahead
D.By no means
听觉性语言中枢位于()
A.颞上回后部
B.额上回
C.颞横回
D.角回
E.海马旁回