A.二條 B.三條 C.五條 D.不分裂
A.2P1/2→2S1/2,2P3/2→2S1/2 B.2S1/2→2P1/2,2S1/2→2P3/2 C.2D3/2→2P1/2,2D3/2→2P3/2
A.0.514V B.1.51V C.5.12V D.9.14V