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已知矩形ABCD的顶点都在半径为4的球O的球面上,且AB=6.BC=2,则棱锥O...
已知矩形ABCD的顶点都在半径为4的球O的球面上,且AB=6.BC=2
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023214050376011107/SYS201310232140503760111014_ST/0.png)
,则棱锥O-ABCD的体积为
.
考点分析:
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已知
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均为单位向量,其夹角为θ,有下列四个命题P
1:|
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+
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|>1⇔θ∈[0,
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);P
2:|
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+
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|>1⇔θ∈(
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,π];P
3:|
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-
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|>1⇔θ∈[0,
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);P
4:|
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,π];其中的真命题是( )
A.P
1,P
4B.P
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4
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