题型:单项选择题 While people may refer to television for up-to-the-minute news, it is unlikely that television _____ the newspaper completely.A.replaced B.have replaced C.replace D.will replace 查看答案
题型:单项选择题 (1)求双曲线9x2-25y2=225的实轴长、虚轴长、焦点坐标、准线方程、渐近线方程、离心率. (2)设直线y=ax+b与双曲线3x2-y2=1交于A、B,以AB为直径的圆过原点,求点P(a,b)的轨迹方程. 查看答案
题型:单项选择题 女,60岁,确诊类风湿关节炎20余年,近年来出现干咳,活动后呼吸困难,肺功能提示弥散功能障碍,最可能合并的疾病是()A.肺间质纤维化B.胸膜炎C.肺炎D.肺结核E.慢性心功能不全 查看答案