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【多选题】
指标和标志之间存在着变换关系,这是指( )
A.
在同一时间内，指标和标志可以互相对调
B.
指标有可能变成标志
C.
标志有可能变成指标
D.
在不同研究目的下，指标和标志可以转化
E.
在任何情况下，指标和标志都可以互相对调
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