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单项选择题Which statement is true for the class java.util.HashSet？（）  

A、 The elements in the collection are ordered.

B、 The collection is guaranteed to be immutable.

C、 The elements in the collection are guaranteed to be unique.

D、 The elements in the collection are accessed using a unique key.

E、 The elements in the collections are guaranteed to be synchronized.

  • C

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