题目: I will _____ Jane today, as she can't come to the meeting herself. [ ]A. take a place of B. take place ofC. instead of D. take the place of 答案: 答案:D
题型:选择题 已知双曲线的方程为x2a2-y2b2=1(a>0,b>0),双曲线的一个焦点到一条渐近线的距离为53c(c为双曲线的半焦距长),则双曲线的离心率为( )A.52B.32C.352D.23 查看答案