A.F->Na+>Mg2+>Al3+B.Na+>Mg2+>Al3+>F-C.Al3+>Mg2+>Na+>F-D.F->Al3+>Mg2+>Na+
A.Ca>Mg>BeB.O>Cl>PC.Si>P>BrD.Br>Si>P
A.青霉素B.氯霉素C.环丙沙星D.庆大霉素