A. E1S B. E1S=E2S C. E1S D. E1S
A. (2,1,0,-1/2); (2,1,1,-1/2) B. (2,2,0,+1/2); (2,2,1,+1/2) C. (2,1,1,+1/2); (2,1,1,-1/2) D. (2,0,0,+1/2); (2,0,0,-1/2)
A. 对 B. 错