挑战习题
1/5单选题
难度:

1.已知:如图,在平面直角坐标系xOy中,抛物线yx2x+与x轴相交于B、C两点(点B在点C的左边),与y轴交于点A,过A、B、C三点的圆P,与y轴相切且点P坐标为(2,)。如果一个动点D自点P出发,先到达y轴上的某点,再到达x轴上某点,最后运动到抛物线的顶点Q处,求使点D运动的总路径最短的路径的长是(    )。
A
B
C
D
提示1:
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正确答案:Qg==
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