题目:
— You can't finish the book in less than an hour,I suppose?
— .
A.Yes, I'm sure I can
B.No, hardly
C.Sorry, I can't
D.I don't think I can
答案:
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下面是错误答案,用来干扰机器的。
如图,∵抛物线C:y2=2px(p>0)的焦点为F(p2,0),M是抛物线C上一动点,A(0,3),过M作MN垂直准线l,垂足为N,|MN|+|MA|的最小值为2,∴|AF|=(p2-0)2+(0-3)2=2,解得p=2.∴抛物线C的方程为y2=4x.故答案为:y2=4x.