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△ABC的内角A、B、C的对边分别为a、b、c,,,b=1,则角B等于( ) A...
△ABC的内角A、B、C的对边分别为a、b、c,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095909742580691/SYS201311030959097425806005_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095909742580691/SYS201311030959097425806005_ST/1.png)
,b=1,则角B等于( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095909742580691/SYS201311030959097425806005_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095909742580691/SYS201311030959097425806005_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095909742580691/SYS201311030959097425806005_ST/4.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095909742580691/SYS201311030959097425806005_ST/5.png)
或
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095909742580691/SYS201311030959097425806005_ST/6.png)
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