64.依照 RBE(relative biological effectiveness)的大小，下列輻射由大到小依序排列的順序，何者正確？  ① 60Co γ-ray ②250 kV X-ray ③150 MeV proton ④14 MeV neutron
(A)①②③④
(B)④③②①
(C)①③②④
(D)④②③①

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統計： A(0), B(2), C(0), D(0), E(0) #3976723