若二次根式
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有意义,则x的取值范围是
.
考点分析:
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如图,在圆锥形的稻草堆顶点P处有一只猫,看到底面圆周上的点A处有一只老鼠,猫沿着母线PA下去抓老鼠,猫到达点A时,老鼠已沿着底面圆周逃跑,猫在后面沿着相同的路线追,在圆周的点B处抓到了老鼠后沿母线BP回到顶点P处.在这个过程中,假设猫的速度是匀速的,猫出发后与点P距离s,所用时间为t,则s与t之间的函数关系图象是( )
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A.
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B.
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C.
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D.
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一条公路弯道处是一段圆弧
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022165127605636740/SYS201310221651276056367005_ST/0.png)
,点O是这条弧所在圆的圆心,点C是
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的中点,OC与AB相交于点D.已知AB=120m,CD=20m,那么这段弯道的半径为( )
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A.200m
B.200
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m
C.100m
D.100
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m
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如图,小聪在作线段AB的垂直平分线时,他是这样操作的:分别以A和B为圆心,大于
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AB的长为半径画弧,两弧相交于C、D,则直线CD即为所求.根据他的作图方法可知四边形ADBC一定是( )
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A.矩形
B.菱形
C.正方形
D.等腰梯形
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不等式组
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022165127605636740/SYS201310221651276056367003_ST/0.png)
的解集是( )
A.x≥3
B.x≤6
C.3≤x≤6
D.x≥6
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如图所示几何体的正视图是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022165127605636740/SYS201310221651276056367002_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022165127605636740/SYS201310221651276056367002_ST/images1.png)
B.
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C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022165127605636740/SYS201310221651276056367002_ST/images3.png)
D.
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