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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...
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( )
A.48
B.18
C.24
D.36
考点分析:
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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
2∈[1,a],当x
2>x
1时,有f(x
2)>f(x
1)>0.则下列不等式不一定成立的是( )
A.f(a)>f(0)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183821039662809/SYS201310241838210396628010_ST/0.png)
C.
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D.
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已知点F
1、F
2分别是双曲线
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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.
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C.(1,2)
D.
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如图,非零向量
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=a,
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=b,且
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,C为垂足,设向量
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,则λ的值为( )
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A.
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B.
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C.
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D.
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已知圆x
2+y
2+2x-4y+1=0关于直线2ax-by+2=0(a,b∈R)对称,则ab的取值范围是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183821039662809/SYS201310241838210396628007_ST/0.png)
B.
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C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183821039662809/SYS201310241838210396628007_ST/2.png)
D.
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已知f(x)=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183821039662809/SYS201310241838210396628006_ST/0.png)
则关于图中的函数图象正确的是( )
A.是f(x-1)的图象
B.是f(-x)的图象
C.是f(|x|)或|f(x)|的图象
D.以上答案都不对
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