题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130137-96367.png)
A.
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130137-82072.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130137-59219.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130137-19016.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130138-59372.png)
答案
解析
试题分析:正三棱锥的相对棱互相垂直,所以
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130138-68631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130138-54165.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130139-15925.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130139-67934.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130139-15655.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130139-93538.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130128-54654.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130128-55145.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130129-60509.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130129-69497.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130129-30514.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130129-79628.png)
A.
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130130-27669.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130130-80554.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130130-99727.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130130-63991.png)
①若一个球的半径缩小到原来的
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130122-48742.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130122-93946.png)
②若两组数据的平均数相等,则它们的标准差也相等;
③直线
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130122-30292.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130123-58153.png)
其中真命题的序号为 .
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130113-91745.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130114-42947.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130114-57361.png)
①三棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130114-87365.png)
②
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130114-24265.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130115-51938.png)
③
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130115-40139.png)
④平面
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130115-13100.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130115-51938.png)
其中正确的命题序号是 .
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130100-56706.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130100-90181.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130100-56288.jpg)
(Ⅰ)在三棱锥上标注出
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130100-99378.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130101-31027.png)
(Ⅱ)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130101-73506.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130101-34387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130101-66750.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130101-73506.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130102-79643.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130102-38075.png)
(Ⅲ)求多面体E-AFNM的体积.
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130052-32359.png)
A.![]() | B.![]() | C.![]() | D.![]() |
最新试题
- 1《订鬼》一文力图从心理方面解释人为什么相信有鬼,有事实根据,有合理分析,表现了作者的唯物主义思想和实事求是的精神,四段文
- 2用动、植物成体的体细胞进行离体培养,下列叙述正确的是[ ]A.都需用CO2培养箱B.都须用液体培养基C.都要在无
- 3如图所示,A、B、C是相同的三盏灯,在滑动变阻器的滑动触头由c端向b端滑动的过程中(各灯都不被烧坏),各灯亮度的变化情况
- 4下列图形是几家电信公司的标志,其中既是轴对称图形又是中心对称图形的是( )
- 5下面是制作人体口腔上皮细胞临时装片的基本步骤,正确的操作顺序应该是①用冷开水漱口 ②用牙签刮口腔侧壁 ③向载玻片上滴
- 6如图,已知在⊙O中,AB= 4,AC是⊙O的直径, AC⊥BD于F,∠A=30° (1)求图中阴影部分的面积;(2)若用
- 7根据汉语完成句子。1. —那是玛丽吗? 一不,她不是.她是莎莉,莎莉比玛丽高。 —___________
- 8( ),是获得成功的重要途径A.树立正确的考试观念B.事实求是地调整自我期望C.增强自身实力D.明确学习的意义,培养
- 9国家规定个人发表文章,出版图书获得稿费的纳税计算办法是:(1)稿费不高于800元的不纳税;(2)稿费高于800元又不高于
- 10太阳活动对地球的影响有[ ]A、扰乱地球上空的大气层,使地面无线电短波通讯受到影响,甚至出现中断 B、使北半
热门考点
- 1设NA表示阿伏加德罗常数的值,下列说法正确的是( )A.含有0.1 NA个CO32-的Na2CO3固体的质量为10.6
- 2(8分)如图A~G是初中化学常见的物质,其中A为黑色固体,E为红色固体,B、C、D通常均为无色气体,F为一种不含氢元素的
- 3Though having lived abroad for years, many Chinese still
- 4列车的车身材料与飞机的相同,采用轻但坚固的优质铝合金材料,“轻”反映了铝合金材料的 物理属性,“坚固”反映了铝合
- 5【题文】(24分)阅读图文资料,完成下列要求。材料 奥兰治河(Orange River)是南非径流量最大的河流
- 6初三(1)班有48名学生,春游前,班长把全班学生对春游地点的意向绘制成了扇形统计图,其中“想去野生动物园的学生数”的扇形
- 7若整式是完全平方式,则实数的值为 ▲ .
- 8下列句子中,加粗成语使用恰当的一句是[ ]A.如今这里是经济开发区,高楼林立,机声隆隆,给人以面目全非的感觉。
- 9三只完全相同的杯子里装有同样的水,把质量相等的铜块、铝块、铁块分别放入这三只杯子里,水未从杯中溢出,水面升高较少的是(
- 10There are many kinds of sports , _____ my favorite is swimmi