23. BSF(backscatter factor)與那些因素有關?①深度 ②射束能量 ③照野大小
(A)僅①②
(B)僅②③
(C)僅①③
(D)①②③
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統計: A(80), B(727), C(93), D(972), E(0) #1150342
統計: A(80), B(727), C(93), D(972), E(0) #1150342