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【单选题】
设函数f(x)=|x 3 -1|φ(x),其中φ(x)在x=1处连续,则φ(1)=0是f(x)在x=1处可导的(    ).
A.
充要条件    
B.
必要但非充分条件
C.
充分但非必要条件    
D.
既非充分也非必要条件
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