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一个几何体的三视图如图所示,则该几何体外接球的表面积为
.
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某企业三月中旬生产A、B、C三种产品共3000件,根据分层抽样的结果,企业统计员制作了如下的统计表格:
产品类别 | A | B | C |
产品数量(件) | | 1300 | |
各层抽取件数 | | 130 | |
由于不小心,表格中A、C产品的有关数据已被污染看不清楚了,统计员只记得A产品的样本容量比C产品的样本容量多10,根据以上信息,可得C产品的数量是
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如果一条直线与一个平面垂直,那么,称此直线与平面构成一个“正交线面对”.在一个正方体中,由两个顶点确定的直线与含有四个顶点的平面构成的“正交线面对”的个数是( )
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设定义域为R的函数f(x)满足下列条件:①对任意x∈R,f(x)+f(-x)=0;②对任意x
1,x
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A.f(a)>f(0)
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183821039662809/SYS201310241838210396628010_ST/0.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183821039662809/SYS201310241838210396628010_ST/1.png)
D.
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已知点F
1、F
2分别是双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183821039662809/SYS201310241838210396628009_ST/0.png)
的左、右焦点,过F
1且垂直于x轴的直线与双曲线交于A、B两点,若△ABF
2为锐角三角形,则该双曲线的离心率e的取值范围是( )
A.(1,+∞)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183821039662809/SYS201310241838210396628009_ST/1.png)
C.(1,2)
D.
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如图,非零向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183821039662809/SYS201310241838210396628008_ST/0.png)
=a,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183821039662809/SYS201310241838210396628008_ST/1.png)
=b,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183821039662809/SYS201310241838210396628008_ST/2.png)
,C为垂足,设向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183821039662809/SYS201310241838210396628008_ST/3.png)
,则λ的值为( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183821039662809/SYS201310241838210396628008_ST/images4.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183821039662809/SYS201310241838210396628008_ST/4.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183821039662809/SYS201310241838210396628008_ST/5.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183821039662809/SYS201310241838210396628008_ST/6.png)
D.
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