• 2022-06-15
    设R={[a,{b}],[c,d],[{a},{d}],[d,{d}]},则fldR=( )。
    A: {a,c,{a},d}
    B: {{b},c,{d}}
    C: {a,c,{a},d,{b},{d}}
    D: {{b},d,{d}}
  • C

    内容

    • 0

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