A:1s22s22p63s23p2→1s22s22p63s23p1
B:1s22s22p63s23p3→1s22s22p63s23p2
C:1s22s22p63s23p4→1s22s22p63s23p3
D:1s22s22p63s23p63d104s24p2→1s22s22p63s23p63d104s24p1
下列各项中成语使用恰当的一项是( )
句型转换。
下列与维持身体的平衡有关的结构是( )