对于抛物线y2=2x上任意一点Q,点P(a,0)都满足|PQ|大于等于|a|,则a的取值范围( )A[0,1] B(0,1) C(负无穷,1] D(负无穷,0)
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![对于抛物线y2=2x上任意一点Q,点P(a,0)都满足|PQ|大于等于|a|,则a的取值范围( )A[0,1] B(0,1) C(负无穷,1] D(负无穷,0)](/uploads/image/z/5298552-0-2.jpg?t=%E5%AF%B9%E4%BA%8E%E6%8A%9B%E7%89%A9%E7%BA%BFy2%3D2x%E4%B8%8A%E4%BB%BB%E6%84%8F%E4%B8%80%E7%82%B9Q%2C%E7%82%B9P%28a%2C0%29%E9%83%BD%E6%BB%A1%E8%B6%B3%7CPQ%7C%E5%A4%A7%E4%BA%8E%E7%AD%89%E4%BA%8E%7Ca%7C%2C%E5%88%99a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%EF%BC%88+%EF%BC%89A%5B0%2C1%5D+B%280%2C1%29+C%28%E8%B4%9F%E6%97%A0%E7%A9%B7%2C1%5D+D%28%E8%B4%9F%E6%97%A0%E7%A9%B7%2C0%EF%BC%89)
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