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一个长方体的各顶点均在同一球面上,且一个顶点上的三条棱的长分别为1,2,3,则此...
一个长方体的各顶点均在同一球面上,且一个顶点上的三条棱的长分别为1,2,3,则此球的表面积为 .
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已知椭圆C:
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(a>b>0)的离心率为
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,过右焦点F且斜率为k(k>0)的直线于C相交于A、B两点,若
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.则k=( )
A.1
B.
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C.
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D.2
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如某几何体的正视图(主视图)是平行四边形,侧视图(左视图)和俯视图都是矩形,则几何体的体积为( )
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A.6
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B.9
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C.12
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D.18
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若一个椭圆长轴的长度、短轴的长度和焦距成等差数列,则该椭圆的离心率是( )
A.
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B.
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C.
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D.
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如图,在正方体ABCD-A
1B
1C
1D
1中,P是侧面BB
1C
1C内一动点,若P到直线BC与直线C
1D
1的距离相等,则动点P的轨迹所在的曲线是( )
A.直线
B.圆
C.双曲线
D.抛物线
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