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若函数\(f\left ( {x} \right )=\sqrt {x}\)在\(x={x}_{0}\)处的瞬时变化率是\(\frac {\sqrt {3}} {3}\),则\({x}_{0}\)的值是( )
A.\(\frac {3} {4}\)
B.\(\frac {1} {2}\)
C.1
D.3
参考答案:A
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