37.介質密度(density of medium)與音波傳導速度(velocity of sound)的乘積稱為:
(A)負荷因子(duty factor)
(B)脈衝長度(spatial pulse length)
(C)音波阻抗(acoustic impedance)
(D)反射係數(intensity reflection coefficient)
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統計: A(61), B(160), C(1679), D(297), E(0) #2625872
統計: A(61), B(160), C(1679), D(297), E(0) #2625872