已知函数y=f(x)y = f(x)y=f(x)二阶可导，且f′′(x0)=0f''(x_0) = 0f′′(x0)=0，则(x0,f(x0))(x_0,f(x_0))(x0,f(x0))是曲线y=f(x)y = f(x)y=f(x)的拐点.（ ）
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