题目
题型:高考真题难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233112-56749.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233112-62072.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233112-95827.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233112-51002.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233112-53007.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233112-13384.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233113-42017.png)
(2)求二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233113-95050.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233113-66741.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233113-26339.png)
得:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233113-24851.png)
同理:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233113-85816.png)
得:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233113-12210.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233114-18584.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233114-63150.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233114-33880.png)
取
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233114-74326.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233114-13620.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233115-30223.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233115-97781.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233115-34915.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233115-98691.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233115-69735.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233116-56367.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233116-63061.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233116-46958.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233116-53454.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233116-25847.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233117-87050.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233117-37516.png)
且
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233117-79811.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233117-43799.png)
设
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233117-89589.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233118-75638.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233118-84801.png)
既二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233118-42597.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233118-79023.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233102-28900.png)
(Ⅱ)若∠BCD=120°,M为线段AE的中点,求证:DM∥平面BEC。
①若l⊥m,m
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233039-42983.png)
③若l∥α,m
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233039-43440.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233033-42635.png)
(II)设E是B1C1上的一点,当
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021233033-39445.png)
最新试题
- 1下列省区轮廓与简称不一致的是( )A.粤B. 苏C.湘D.鲁
- 2During his life time, Edison ______ 1093 inventions.[ ]A
- 3两只灯泡,甲灯标有“9V 6W”、乙灯标有“18V 6W”,则电阻大的是____灯。如果将它们串联接在9V的电路上,
- 4我国社会主义法的制定的“实事求是,从实际出发”的原则是指( )①必须从我国社会主义初级阶段的政治、经济、文化、思想
- 5It"s time______Henry______home.[ ]A. of, to go B. for,
- 6It"s high time that you ________ even harder at your lessons
- 7已知对称中心为原点的双曲线与椭圆有公共的焦点,且它们的离心率互为倒数,则该椭圆的标准方程为_______________
- 8阅读材料,回答问题。 和田地区位于新疆西南部,是维吾尔族群众聚居地。和田地区人均耕地面积不足1亩,是全疆人均耕地最少的
- 9某温度下的定容密闭容器中,进行可逆反应:A(s)+2B(g)C(g)+D(g),当下列物理量不发生变化时:①混合气体的密
- 10 Is it easier to make plans _____ trips now?A.toB.forC.ofD.o
热门考点
- 1下列关于万有引力定律说法正确的是[ ]A.万有引力定律是牛顿发现的 B.万有引力定律适用于质点间的相互作用 C.
- 2Kate went to work _______ she was ill last week. [ ]A. t
- 3听对话,回答问题。1. What is Tom going to do on Saturday? A. He is go
- 4打预防针前常用酒精棉球在皮肤上消毒,皮肤有凉爽的感觉,这是因为酒精 时从皮肤吸热,使皮肤的温度 (
- 5下列 句子中没有语病的一项是( )A.出席这次铁路职工代表大会的有青年工人、老工人和妇女。〈"青年工人"和"老工人",
- 6下面这段文字画线的两句话,各有一处语病,请加以修改。 人的一生,有三分之一时间在睡眠中度过。①人的健康对于睡眠,就像呼
- 7关于非金属元素Si、N、S、Cl的叙述,正确的是 ( )A.通常情况下,它们的单质均为气体B.它们在自然界中都存在游离
- 8阅读下面的文字,完成1―3题。瓦斯的开发和利用 我国是煤炭生产大国,瓦斯突出的矿井约占煤炭矿井的一半。瓦斯是煤矿安全的
- 919世纪英国作家惠兹里特说:“一个除了书本以外一无所知的纯粹学者,必然对书本也是无知的。”下列名言中与这句话蕴涵的哲理相
- 10在凸透镜成像实验中,测得透镜与物体AB及光屏之间的相对位置如图时,光屏上恰好得到清晰的像,由此可知这个凸透镜的焦距应该是