多项选择题
A.E:nth-child(2n)B.E:nth-child(2n-1)C.E:nth-child(odd)D.E:nth-child(even)
A.E:enabledB.E:disabledC.E::selectionD.E:checked
A.[src^=user]{}B.[src*=user]{}C.[src\=user]{}D.[src$=user]{}