函数y=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100029637238531/SYS201311031000296372385010_ST/0.png)
的最小值为( )
A.6
B.7
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100029637238531/SYS201311031000296372385010_ST/1.png)
D.9
考点分析:
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已知过曲线
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(θ为参数,0≤θ≤π)上一点P与原点O的直线PO的倾斜角为
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,则P点坐标是( )
A.(
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,
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)
B.
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C.(
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,
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)
D.
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在直角坐标系xOy中,直线Z的参数方程为
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.则直线l和曲线C的公共点有( )
A.0个
B.l个
C.2个
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若不等式|ax+2|<6的解集为(-1,2),则实数a等于( )
A.8
B.2
C.-4
D.-8
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以平面直角坐标系的原点为极点,以x轴的正半轴为极轴,建立极坐标系,则曲线
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A.
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B.0
C.1
D.
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A.
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B.
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C.
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D.
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