30.病人進行骨髓移植前,需使用全身照射,常使用的射源是何種裝置?
(A)megavoltage photon beams
(B)high-energy electrons
(C)137Cs
(D)heavy-charged particles
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統計: A(1837), B(782), C(96), D(105), E(0) #2181884
統計: A(1837), B(782), C(96), D(105), E(0) #2181884