45.直線加速器機頭結構內用來將光子射束擴散成大照野的構件為:
(A)X光靶(target)
(B)散射薄片(scattering foil)
(C)平坦濾片(flattening filter)
(D)第一準直儀(primary collimator)
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統計: A(30), B(65), C(455), D(124), E(0) #1067793
統計: A(30), B(65), C(455), D(124), E(0) #1067793