单项选择题
A.92.3%B.94.7%C.97.4%D.99.1%
A.堆芯B.反射层C.热屏蔽和生物屏蔽D.堆内各处
A.0.01μmB.0.001μmC.0.01mmD.0.001mm
A.12KeVB.12MeVC.168KeVD.168MeV
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