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请写出两个我们学过的,既是中心对称、又是轴对称的几何图形 .
请写出两个我们学过的,既是中心对称、又是轴对称的几何图形 .
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下列说法中正确的是( )
A.
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B.方程2x
2=x的根是x=
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C.相等的弦所对的弧相等
D.明天会下雨是随机事件
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如图,一块含有30°角的直角三角板ABC,在水平桌面上绕点C接顺时针方向旋转到A′B′C′的位置.若BC=15cm,那么顶点A从开始到结束所经过的路径长为( )
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A.10πcm
B.30πcm
C.15πcm
D.20πcm
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二次根式
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中,最简二次根式的概率是( )
A.
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B.
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C.
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D.
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圆锥侧面展开图可能是下列图中的( )
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A.
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B.
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C.
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D.
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下列一元二次方程中没有实数根是( )
A.x
2+3x+4=0
B.x
2-4x+4=0
C.x
2-2x-5=0
D.x
2+2x-4=0
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