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现有五个球分别记为A,C,J,K,S,随机放进三个盒子,每个盒子只能放一个球,则...
现有五个球分别记为A,C,J,K,S,随机放进三个盒子,每个盒子只能放一个球,则K或S在盒中的概率是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230816344343764/SYS201311012308163443437008_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230816344343764/SYS201311012308163443437008_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230816344343764/SYS201311012308163443437008_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230816344343764/SYS201311012308163443437008_ST/3.png)
考点分析:
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有一笔统计资料,共有11个数据如下(不完全依大小排列)2,4,4,5,5,6,7,8,9,11,x,已知这组数据的平均数为6,则这组数据的方差为( )
A.6
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230816344343764/SYS201311012308163443437007_ST/0.png)
C.66
D.6.5
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已知抛物线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230816344343764/SYS201311012308163443437006_ST/0.png)
有相同的焦点F,点A是两曲线的交点,且AF⊥x轴,则双曲线的离心率为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230816344343764/SYS201311012308163443437006_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230816344343764/SYS201311012308163443437006_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230816344343764/SYS201311012308163443437006_ST/3.png)
D.
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双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230816344343764/SYS201311012308163443437005_ST/0.png)
的渐近线方程是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230816344343764/SYS201311012308163443437005_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230816344343764/SYS201311012308163443437005_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230816344343764/SYS201311012308163443437005_ST/3.png)
D.
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直线x=2被圆(x-a)
2+y
2=4所截弦长等于
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230816344343764/SYS201311012308163443437004_ST/0.png)
,则a的值为( )
A.-1或-3
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230816344343764/SYS201311012308163443437004_ST/1.png)
或
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230816344343764/SYS201311012308163443437004_ST/2.png)
C.1或3
D.
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椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230816344343764/SYS201311012308163443437003_ST/0.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230816344343764/SYS201311012308163443437003_ST/1.png)
=1上一点P到它一个焦点的距离是7,则P到另一个焦点的距离是( )
A.17
B.15
C.3
D.1
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