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在区间[-1,2]上随即取一个数x,则x∈[0,1]的概率为 .
在区间[-1,2]上随即取一个数x,则x∈[0,1]的概率为 .
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设向量
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,定义一运算:
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⊗(b
1,b
2)=(a
1b
1,a
2b
2).已知
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,点Q在y=f(x)的图象上运动,且满足
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(其中O为坐标原点),则y=f(x)的最大值及最小正周期分别是( )
A.
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B.
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C.2,π
D.2,4π
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如图,某几何体的正视图与侧视图都是边长为1的正方形,且体积为
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.则该几何体的俯视图可以是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124046257023613/SYS201310251240462570236007_ST/images2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124046257023613/SYS201310251240462570236007_ST/images3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124046257023613/SYS201310251240462570236007_ST/images4.png)
D.
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某程序框图如图所示,该程序运行后,输出的x值为31,则a等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124046257023613/SYS201310251240462570236006_ST/images0.png)
A.0
B.1
C.2
D.3
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函数f(x)=
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的零点个数为( )
A.0
B.1
C.2
D.3
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