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已知a<0,b<-1,那么下列不等式成立的是( ) A. B. C. D.
已知a<0,b<-1,那么下列不等式成立的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225157519442834/SYS201311012251575194428003_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225157519442834/SYS201311012251575194428003_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225157519442834/SYS201311012251575194428003_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225157519442834/SYS201311012251575194428003_ST/3.png)
考点分析:
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A.10
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函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225157519442834/SYS201311012251575194428001_ST/0.png)
( )
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设
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225157519442834/SYS201311012251575194428000_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225157519442834/SYS201311012251575194428000_ST/1.png)
分别是与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225157519442834/SYS201311012251575194428000_ST/2.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225157519442834/SYS201311012251575194428000_ST/3.png)
向的单位向量,则下列结论中正确的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225157519442834/SYS201311012251575194428000_ST/4.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225157519442834/SYS201311012251575194428000_ST/5.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225157519442834/SYS201311012251575194428000_ST/6.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225157519442834/SYS201311012251575194428000_ST/7.png)
=1
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225157519442834/SYS201311012251575194428000_ST/8.png)
|+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225157519442834/SYS201311012251575194428000_ST/9.png)
=2
D.|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225157519442834/SYS201311012251575194428000_ST/10.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225157519442834/SYS201311012251575194428000_ST/11.png)
|=2
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