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[多选题]
下列关于一次差的说法正确的是()
A
B
C
D
E
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参考答案
试题答案:
A
C
D
E
答案解释:
本题考查时间序列一次差,时间序列等于本期值减去上期值,所以可能为正,也可能为负,故B选项错误,本题选ACDE。
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