命题“对任意的X∈R,x3-x2+1≤0”的否定是: .
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某商场有四类食品,其中粮食类、植物油类、动物性食品类及果蔬类分别有40种、10种、30种、20种,从中抽取一个容量为20的样本进行食品安全检测.若采用分层抽样的方法抽取样本,则抽取的植物油类与果蔬类食品种数之和是
.
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已知点F
1、F
2分别是椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158762356/SYS201311031024481587623011_ST/0.png)
的左、右焦点,过F
1且垂直于x轴的直线与椭圆交于A、B两点,若△ABF
2为正三角形,则该椭圆的离心率e是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158762356/SYS201311031024481587623011_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158762356/SYS201311031024481587623011_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158762356/SYS201311031024481587623011_ST/3.png)
D.
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若直线x-y=2被圆(x-a)
2+y
2=4所截得的弦长为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158762356/SYS201311031024481587623010_ST/0.png)
,则实数a的值为( )
A.-1或
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B.1或3
C.-2或6
D.0或4
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已知△ABC中,a,b,c分别为角A,B,C的对边,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158762356/SYS201311031024481587623009_ST/0.png)
,则∠B等于( )
A.60°
B.30°或150°
C.60°
D.60°或120°
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若a是从集合{0,1,2,3}中随机抽取的一个数,b是从集合{0,1,2}中随机抽取的一个数,则关于x的方程x
2+2ax+b
2=0有实根的概率是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158762356/SYS201311031024481587623008_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158762356/SYS201311031024481587623008_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158762356/SYS201311031024481587623008_ST/2.png)
D.
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