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如图在正四棱锥S-ABCD中,E是BC的中点,P点在侧面△SCD内及其边界上运动...
如图在正四棱锥S-ABCD中,E是BC的中点,P点在侧面△SCD内及其边界上运动,并且总是保持PE⊥AC,则动点P的轨迹与△SCD组成的相关图形是( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101729077540301/SYS201311031017290775403009_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101729077540301/SYS201311031017290775403009_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101729077540301/SYS201311031017290775403009_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101729077540301/SYS201311031017290775403009_ST/images3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101729077540301/SYS201311031017290775403009_ST/images4.png)
考点分析:
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