已知双曲线x2a2-y2b2=1(a>0,b>0)的一个焦点到一条渐近线的距离为 发布时间:2017-04-29 22:10 │ 来源:www.tikuol.com 题型:选择题 问题: 已知双曲线x2a2-y2b2=1(a>0,b>0)的一个焦点到一条渐近线的距离为33c(c为双曲线的半焦距长),则该双曲线的离心率为( )A.2B.62C.3D.2
题型:选择题 During the busiest season like National Day, Spring Festival, the traffic company provides______ buses for the traveler. [ ]A. extra B. certain C. various D. unusual 查看答案