49.直線加速器機頭結構內用來將電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(5), B(263), C(6), D(22), E(0) #1068436
統計: A(5), B(263), C(6), D(22), E(0) #1068436