单项选择题
A.1s2p,1s1p B.1s2p,2d3p C.2d3p,2p3s D.1s2p,2p3s
A.主线系B.第二辅线系C.第一辅线系D.柏格漫线系
A.3P0,1,2,3S1 B.3P0,1,2,1S0 C.1P1,3P0,1,2 D.3S1,1P1