（5分）从椭圆上一点P向x轴作垂线，垂足恰为左焦点F1，A是椭圆与x轴正半轴的交点，B是椭圆与y轴正半轴的交点，且AB∥OP（O是坐标原点），则该椭圆的离心率是

题干

（5分）从椭圆

上一点P向x轴作垂线，垂足恰为左焦点F₁，A是椭圆与x轴正半轴的交点，B是椭圆与y轴正半轴的交点，且AB∥OP（O是坐标原点），则该椭圆的离心率是（　　）

A：

B：

C：

D：

上一题下一题 0.0难度选择题更新时间:2016-05-23 06:50:44

答案(点此获取答案解析）

C

同类题1

阅读理解

B

I'm at Billy's birthday party. There are a lot of friends in his house. Some stand beside the table and enjoy the snacks and drinks. There is some food on the table. I like the chocolate and the fruit very much. Billy sits in the sofa and chats with some friends there. He wears a red T-shirt and a pair of blue jeans. He looks so cool today. Wow! The cake is really big. There are some candles on it. Billy's friends begin to sing 'Happy Birthday' to Billy. Billy is very excited. He blows out the candles (吹蜡烛) and cuts the cake. Everyone has fun at the party.

题干

答案(点此获取答案解析）

同类题1

同类题2

同类题3

同类题4

同类题5