46 X-rays、γ-rays 及 electrons 三種射束的射質因素（Quality factor, Q）之關係為何？
(A) X-rays > γ-rays > electrons
(B) γ-rays > electrons > X-rays
(C) electrons > X-rays > γ-rays
(D) X-rays = γ-rays = electrons

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統計： A(40), B(15), C(19), D(157), E(0) #1062622