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【多选题】
时间数列中的速度指标主要有(    )。
A.
发展速度和环比发展速度    
B.
增长速度和环比增长速度
C.
各环比发展速度的序时平均数    
D.
各环比增长速度的序时平均数
E.
平均增长量
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