18.根據AAPM TG-51號報告中,對於電子射束品質(beam quality)的依據為何?
(A)Rp
(B)R50
(C)R80
(D)R90
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統計: A(191), B(738), C(26), D(35), E(0) #1053293
統計: A(191), B(738), C(26), D(35), E(0) #1053293