31.超音波鏡面影像假影(mirror image artifacts),主要是由下列何者造成?
(A)速度誤差(speed error)
(B)脈衝寬度(pulse width)
(C)多重反射(multiple reflection)
(D)高衰減(high attenuation)
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統計: A(179), B(24), C(892), D(154), E(0) #1050350
統計: A(179), B(24), C(892), D(154), E(0) #1050350