题目内容
A，B是两个不同点，则一个圆到A和B距离相等的切线（）。
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实数x，y，满足(x-1)2+(y+2)2=5，求x-2y的最大值．
在社会主义市场经济条件下，应完全由企业自主定价。 ( )
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若一个圆柱和圆锥的底的直径和高都与一个球的直径相等，则圆柱、圆锥与球的体积之比为（）。
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