27.在脈衝式超音波中,若提高其脈衝重複頻率(pulse repetition frequency),則會造成其
SPTA強度(spatial peak-temporal average intensity)作何改變?
(A)升高
(B)降低
(C)不變
(D)消失
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統計: A(1310), B(215), C(60), D(14), E(0) #1042727
統計: A(1310), B(215), C(60), D(14), E(0) #1042727