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在△ABC中,∠C=90°,AB=2,AC=1,则sinB的值是( ) A. B...
在△ABC中,∠C=90°,AB=2,AC=1,则sinB的值是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193839494611044/SYS201311011938394946110010_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193839494611044/SYS201311011938394946110010_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193839494611044/SYS201311011938394946110010_ST/2.png)
D.2
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A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193839494611044/SYS201311011938394946110007_ST/0.png)
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![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193839494611044/SYS201311011938394946110006_ST/0.png)
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C.
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![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193839494611044/SYS201311011938394946110005_ST/1.png)
的值相等,则x的值是( )
A.9
B.7
C.5
D.3
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