皮皮学,免费搜题
登录
logo - 刷刷题
搜题
【简答题】
如图,已知椭圆的长轴A 1 A 2 与x轴平行,短轴B 1 B 2 在y轴上,中心M(0,r)(b>r>0 (Ⅰ)写出椭圆方程并求出焦点坐标和离心率; (Ⅱ)设直线y=k 1 x与椭圆交于C(x 1 ,y 1 ),D(x 2 ,y 2 )(y 2 >0),直线y=k 2 x与椭圆次于G(x 3 ,y 3 ),H(x 4 ,y 4 )(y 4 >0).求证: k 1 x 1 x 2 x 1 + x 2 = k 1 x 3 x 4 x 3 + x 4 ; (Ⅲ)对于(Ⅱ)中的在C,D,G,H,设CH交x轴于P点,GD交x轴于Q点,求证:|OP|=|OQ| (证明过程不考虑CH或GD垂直于x轴的情形)
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
微信内点击右上角“…”即可分享
反馈
参考答案:
举一反三
【单选题】患者,女性,30岁,有风湿性心脏病史6年,今晨突感右侧肢体活动不便,不
A.
脑出血
B.
脑栓塞
C.
脑血栓形成
D.
蛛网膜下腔出血
E.
脑肿瘤
【单选题】患者女性,30岁,有风湿性心脏病史6年,今晨突感右侧肢体活动不便,口角歪斜。应首先考虑:
A.
脑出血
B.
脑栓塞
C.
脑肿瘤
D.
脑血栓形成
E.
蛛网膜下隙出血
【单选题】In paragraph two, the writer argues that business school research
A.
takes a negative view of the business communit
B.
has failed to give credibility to management as a disciplin
C.
is directed at the wrong audienc
D.
does not stand up to academic scrutin
【单选题】患者,女,30岁,有风湿性心脏病,二尖瓣狭窄病史10余年,现孕6个月,今日起突感气促,不能平卧,体验:发绀,两肺满布湿性啰音,伴喘鸣。诊断应首先考虑
A.
充血性心力衰竭
B.
感染性心内膜炎
C.
肺部感染
D.
动脉栓塞
E.
急性肺水肿
【单选题】女性,30岁,有风湿性心脏病病史6年,今晨突感右侧肢体活动不便,不能下床,护士发现其口角歪斜,应考虑
A.
脑出血
B.
脑栓塞
C.
蛛网膜下腔出血
D.
脑肿瘤
E.
脑血栓形成
【单选题】Comment les députés sont-ils élus ?
A.
Au scrutin proportionnel
B.
Au scrutin majoritaire
【判断题】转下级机关与同级机关的公文,应用“批转”;转上级机关或不相隶属机关的公文,用“转发”。
A.
正确
B.
错误
【单选题】Why do you teach? My friend asked the question when I told him that I didn't want to be considered for an administrative position. He was puzzled that I did not want what was an obvious 'step-up' towa...
A.
teaching is easy for him
B.
he likes to share his knowledge with students
C.
he likes to see his students taking notes on what he says in class
D.
he likes the pace of a teacher's life
【单选题】女,30岁,有风湿性心脏病史6年,今晨突感右侧肢体活动不便,口角歪斜,应首先考虑
A.
脑出血
B.
脑栓塞
C.
脑血栓形成
D.
蛛网膜下腔出血
E.
脑肿瘤
【简答题】III. 阅读(共两节,满分40分) 第一节阅读理解(共15小题;每小题2分,满分30分) 阅读下列短文,从媒体所给的A、B、C和D项中,选出最佳选项,并在答题卡上将该项涂黑。 In Stockholm, the Swedish Academy has chosen the British author Doris Lessing for the 2007 Nobel Prize in Liter...
相关题目:
参考解析:
知识点:
题目纠错 0
发布
创建自己的小题库 - 刷刷题