某几何体的三视图如图所示,则该几何体的体积为
.
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在正项等比数列{a
n}中,若a
4•a
8=9,则a
6=
.
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如图,已知圆M:(x-3)
2+(y-3)
2=4,四边形 ABCD为圆M的内接正方形,E,F分别为边AB,AD的中点,当正方形ABCD绕圆心M转动时,
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的取值范围是( )
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A.
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B.[-6,6]
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124247471724012/SYS201310251242474717240009_ST/2.png)
D.[-4,4]
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若双曲线的右焦点F到一条渐近线的距离是点F到右顶点的距离与点F到中心的距离的等差中项,则离心率e=( )
A.
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B.
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C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124247471724012/SYS201310251242474717240008_ST/2.png)
D.
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在△ABC中,角A,B,C所对的边分别为a,b,c,若3bcosA=ccosA+acosC,则tanA的值是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124247471724012/SYS201310251242474717240007_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124247471724012/SYS201310251242474717240007_ST/1.png)
C.
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D.
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在某次大型活动期间,随机分派甲、乙、丙、丁四名志愿者分别担任A、B、C、D四项不同的工作,则甲担任D项工作且乙不担任A项工作的概率是( )
A.
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B.
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C.
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D.
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