15.下列核種何者不是易裂材料(fissile material):
(A) 239Pu
(B) 233U
(C) 232Th
(D) 241Pu
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統計: A(0), B(1), C(0), D(0), E(0) #1038881
統計: A(0), B(1), C(0), D(0), E(0) #1038881