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(2007•长春)一根单线从钮扣的4个孔中穿过(每个孔只穿过一次),其正面情形如...
(2007•长春)一根单线从钮扣的4个孔中穿过(每个孔只穿过一次),其正面情形如图所示,下面4个图形中可能是其背面情形的是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131019110423216694027/SYS201310191104232166940005_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131019110423216694027/SYS201310191104232166940005_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131019110423216694027/SYS201310191104232166940005_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131019110423216694027/SYS201310191104232166940005_ST/images3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131019110423216694027/SYS201310191104232166940005_ST/images4.png)
考点分析:
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![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131019110423216694027/SYS201310191104232166940001_ST/0.png)
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B.
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D.
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C.
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