已知点P(2,-3)是双曲线x2a2-y2b2=1(a>0,b>0)上一点,双曲 发布时间:2017-04-28 22:30 │ 来源:www.tikuol.com 题型:填空题 问题: 已知点P(2,-3)是双曲线x2a2-y2b2=1(a>0,b>0)上一点,双曲线两个焦点间的距离等于4,则该双曲线方程是______.
题型:填空题 男性,32岁,呼吸困难3~4年,查体:负性心尖搏动,心尖区舒张期杂音及开瓣音。该患者负性心尖搏动说明()A.左室明显增大B.左室轻度增大C.右室轻度增大D.右室明显增大E.左右室皆增大 查看答案
题型:填空题 Optimism had been growing ________ the weekend meeting of European Union leaders in Brussels would come up with a substantial plan for dealing with the debt crisis. [ ]A. whenB. beforeC. whatD. that 查看答案