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为庆祝“六•一”儿童节,某幼儿园举行用火柴棒摆“金鱼”比赛.如图所示:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192737362094545/SYS201311011927373620945015_ST/images0.png)
按照上面的规律,摆n个“金鱼”需用火柴棒的根数为( )
A.2+6n
B.8+6n
C.4+4n
D.8n
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不等式组
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192737362094545/SYS201311011927373620945014_ST/0.png)
的解集在数轴上表示正确的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192737362094545/SYS201311011927373620945014_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192737362094545/SYS201311011927373620945014_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192737362094545/SYS201311011927373620945014_ST/images3.png)
D.
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如图,直径为10的⊙A经过点C(0,5)和点O(0,0),B是y轴右侧⊙A优弧上一点,则∠OBC的正弦值为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192737362094545/SYS201311011927373620945013_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192737362094545/SYS201311011927373620945013_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192737362094545/SYS201311011927373620945013_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192737362094545/SYS201311011927373620945013_ST/2.png)
D.
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抛物线y=-x
2+bx+c的部分图象如图所示,要使y>0,则x的取值范围是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192737362094545/SYS201311011927373620945012_ST/images0.png)
A.-4<x<1
B.-3<x<1
C.x<-4或x>1
D.x<-3或x>1
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如图,⊙O的弦AB垂直于直径MN,C为垂足,若OA=5cm,下面四个结论中可能成立的是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192737362094545/SYS201311011927373620945011_ST/images0.png)
A.AB=12cm
B.OC=6cm
C.MN=8cm
D.OC=2.5cm
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