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在实数数列{an}中,已知a1=0,|a2|=|a1-1|,|a3|=|a2-1...
在实数数列{an}中,已知a1=0,|a2|=|a1-1|,|a3|=|a2-1|,…,|an|=|an-1-1|,则a1+a2+a3+a4的最大值为( )
A.0
B.1
C.2
D.4
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