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对于Map("book"->5,"pen"->2).map(m=>m._1->m._2*2)结果说法正确的是?()

  • A、Map("bookbook"->5,"penpen"->2)
  • B、Map("bookbook"->10,"penpen"->4)
  • C、Map("book"->10,"pen"->4)
  • D、Map("book"->5,"pen"->2,"book"->5,"pen"->2)

参考答案

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