曲线y=x13y = x^{\dfrac{1}{3}}y=x31的拐点是( ).
(A)(0,1)(0,1)(0,1)
(B)(1,1)(1,1)(1,1)
(C)(0,0)(0,0)(0,0)
(D)(2,213)(2,2^{\dfrac{1}{3}})(2,231)
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