将一副三角板按图中方式叠放,则角α的度数为
.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192845963673094/SYS201311011928459636730010_ST/images0.png)
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2.
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B.
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C.
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D.
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