17.下列何種光子射束劑量參數,理論上不需使用到空氣中的量測值?
(A)tissue air ratio
(B)scatter air ratio
(C)collimator scatter factor
(D)phantom scatter factor
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統計: A(84), B(67), C(479), D(1299), E(0) #2972531
統計: A(84), B(67), C(479), D(1299), E(0) #2972531