15.某治療用光子射束,其在空氣中相對於參考照野的劑量輸出比值稱為:
(A)collimator scatter factor
(B)phantom scatter factor
(C)output factor
(D)tissue-air-ratio
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統計: A(931), B(147), C(132), D(740), E(0) #1635521
統計: A(931), B(147), C(132), D(740), E(0) #1635521