执行右图所示的程序框图,输出结果y的值是
.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212121702396991/SYS201310232121217023969008_ST/images0.png)
考点分析:
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如图,在直三棱柱A
1B
1C
1-ABC中,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212121702396991/SYS201310232121217023969007_ST/0.png)
,AB=AC=AA
1=2,点G与E分别为线段A
1B
1和C
1C的中点,点D与F分别为线段AC和AB上的动点.若GD⊥EF,则线段DF长度的最小值是( )
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A.
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B.1
C.
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D.
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设f(x)、g(x)是R上的可导函数,f′(x),g′(x)分别为f(x)、g(x)的导函数,且满足f′(x)g(x)+f(x)g′(x)<0,则当a<x<b时,有( )
A.f(x)g(b)>f(b)g(x)
B.f(x)g(a)>f(a)g(x)
C.f(x)g(x)>f(b)g(b)
D.f(x)g(x)>f(b)g(a)
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已知函数f(x)=log
2x,若|f(x)|≥1,则实数x的取值范围是( )
A.(-∞,
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]
B.[2,+∞)
C.(0,
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]∪[2,+∞)
D.(-∞,
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]∪[2,+∞)
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212121702396991/SYS201310232121217023969004_ST/images0.png)
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212121702396991/SYS201310232121217023969004_ST/0.png)
分别表示甲乙两名运动员这项测试成绩的平均数,s
1,s
2分别表示甲乙两名运动员这项测试成绩的标准差,则有( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212121702396991/SYS201310232121217023969004_ST/1.png)
,s
1<s
2B.
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,s
1<s
2C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212121702396991/SYS201310232121217023969004_ST/3.png)
,s
1=s
2D.
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,s
1>s
2
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“
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”是“A=30°”的( )
A.充分而不必要条件
B.必要而不充分条件
C.充分必要条件
D.既不充分也必要条件
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