设双曲线x2a2-y2b2=1的一条渐近线与抛物线y=x2+1只有一个公共点，则双曲线的离心率为_刷题宝

题干

设双曲线

x

2

a

2

-

y

2

b

2

=1的一条渐近线与抛物线y=x2+1只有一个公共点，则双曲线的离心率为（）

A： $\frac{\sqrt{5}}{2}$

B：5

C： $\frac{5}{4}$

D： $\sqrt{5}$

上一题下一题 0.0难度选择题更新时间:2019-03-24 10:26:04

答案(点此获取答案解析）

D

同类题1

在探究“影响电磁铁磁性强弱的因素”实验中，小明用相同的漆包线和铁钉绕制成电磁铁A和B，电磁铁A的线圈匝数为200匝，电磁铁B的线圈匝数为50匝，并连接成1所示的电路。

同类题2

用圆规画一个直径是3厘米的圆，它的两脚叉开的距离是（）

同类题3

阅读短文，填空。

Look! This is a picture. It is about Jenny's birthday. Her birthday is on May 25. On that day last year, she invited her friends to her house. Li Ming, Tom and I went to her house. We had a very good time. Before eating the birthday cake, we sang the birthday song for Jenny. She was very happy. And we were happy, too. After lunch, we went out to play in the park. We had fun all day.

同类题4

对下边漫画认识正确的是（）

同类题5

下列实验现象的描述不正确的是（）

小学学科试题库

初中学科试题库

高中学科试题库