18.下列何種參數是特別設計來計算光子射束於假體內散射劑量的變化?
(A)scatter maximum ratio
(B)collimator scatter factor
(C)percent depth dose
(D)exponential attenuation factor
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統計: A(1201), B(329), C(113), D(68), E(0) #3199516
統計: A(1201), B(329), C(113), D(68), E(0) #3199516