which statement is true for the class java.util.ArrayList?

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     A.集合中的元素是有序的   对

     B.集合被保证为不可变的  错

     C.集合中的元素被保证为唯一的  错  有序的 所以不唯一

     D.集合中的元素使用一个唯一的键来存取   错   没有键

     E.集合中的元素被保证为同步的   错  不是同步的

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