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一个底面是正三角形的三棱柱的正视图如图所示,则其体积等于( ) A.6 B.2 ...
一个底面是正三角形的三棱柱的正视图如图所示,则其体积等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231034495848774/SYS201311012310344958487008_ST/images0.png)
A.6
B.2
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231034495848774/SYS201311012310344958487008_ST/0.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231034495848774/SYS201311012310344958487008_ST/1.png)
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下列命题:
①平行于同一平面的两直线平行;
②垂直于同一平面的两直线平行;
③平行于同一直线的两平面平行;
④垂直于同一直线的两平面平行;
其中正确的有( )
A.②和④
B.①、②和④
C.③和④
D.②、③和④
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正三棱锥的一个侧面面积与底面面积之比为2:3,则此三棱锥的高与斜高之比为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231034495848774/SYS201311012310344958487006_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231034495848774/SYS201311012310344958487006_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231034495848774/SYS201311012310344958487006_ST/2.png)
D.
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下列函数是偶函数且在(0,+∞)上是增函数的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231034495848774/SYS201311012310344958487005_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231034495848774/SYS201311012310344958487005_ST/1.png)
C.y=ln
D.y=-x
2+1
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下列函数f(x),g(x)表示的是相同函数的是( )
A.f(x)=2
x,g(x)=log
2B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231034495848774/SYS201311012310344958487004_ST/0.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231034495848774/SYS201311012310344958487004_ST/1.png)
D.f(x)=2lgx,g(x)=lg(2x)
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已知函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231034495848774/SYS201311012310344958487003_ST/0.png)
,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231034495848774/SYS201311012310344958487003_ST/1.png)
的值是( )
A.-3
B.3
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231034495848774/SYS201311012310344958487003_ST/2.png)
D.
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