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已知a是实数,则函数f(x)=acosax的图象可能是( ) A. B. C. ...
已知a是实数,则函数f(x)=acosax的图象可能是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183821039670533/SYS201310241838210396705006_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183821039670533/SYS201310241838210396705006_ST/images1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183821039670533/SYS201310241838210396705006_ST/images2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183821039670533/SYS201310241838210396705006_ST/images3.png)
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B.α⊥β⇒l∥m
C.l⊥m⇒α∥β
D.l∥m⇒α⊥β
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经过圆x
2+2x+y
2=0的圆心C,且与直线x+y=0垂直的直线方程是( )
A.x+y+1=0
B.x+y-1=0
C.x-y+1=0
D.x-y-1=0
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已知
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,则sin2α等于( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183821039670533/SYS201310241838210396705003_ST/1.png)
B.-
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C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183821039670533/SYS201310241838210396705003_ST/3.png)
D.-
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设z
1=1+i,z
2=1-i(i是虚数单位),则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183821039670533/SYS201310241838210396705002_ST/0.png)
=( )
A.-i
B.i
C.0
D.1
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已知a,b是实数,则“a=1且b=1”是“a+b=2”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.既不充分也不必要条件
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