26.超音波陰影假影(shadowing artifacts),主要是由下列何者造成?
(A)高衰減(high attenuation)
(B)速度誤差(speed error)
(C)多重反射(multiple reflection)
(D)脈衝長度(pulse length)
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統計: A(1782), B(38), C(102), D(9), E(0) #1633972
統計: A(1782), B(38), C(102), D(9), E(0) #1633972