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单选题
list（map（abs，[1，-2，-5]））返回值为（）。
A
[1，-2，-5]
B
[-1，-2，-5]
C
[1，2，5]
D
[-1，2，5]
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考题
单选题表达式abs（-1）返回值是（）A
-1B
0C
trueD
1
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