脏器的轮廓信息是通过（）获得的The contour information of organs is obtained by ultrasonic（）

脏器的轮廓信息是通过（）获得的The contour information of organs is obtained by ultrasonic（）
A.反射回波Reflection echo
B.散射回波Scattering echo
C.衍射diffraction
D.透射transmission
正确答案：反射回波Reflection echo