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有4个命题: ①O,A,B,C为空间四点,且不构成空间的一个基底,那么点O,A,...
有4个命题:
①O,A,B,C为空间四点,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224517685169763/SYS201311012245176851697000_ST/0.png)
不构成空间的一个基底,那么点O,A,B,C一定共面
②若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224517685169763/SYS201311012245176851697000_ST/1.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224517685169763/SYS201311012245176851697000_ST/2.png)
共线,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224517685169763/SYS201311012245176851697000_ST/3.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224517685169763/SYS201311012245176851697000_ST/4.png)
共线,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224517685169763/SYS201311012245176851697000_ST/5.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224517685169763/SYS201311012245176851697000_ST/6.png)
共线
③若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224517685169763/SYS201311012245176851697000_ST/7.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224517685169763/SYS201311012245176851697000_ST/8.png)
共面,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224517685169763/SYS201311012245176851697000_ST/9.png)
④若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224517685169763/SYS201311012245176851697000_ST/10.png)
,则P,M,A,B共面
其中,真命题的个数是( )
A.1
B.2
C.3
D.4
考点分析:
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