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在Rt△ABC中,∠C=90°,a=4,b=3,则sinA的值是( ) A. B...
在Rt△ABC中,∠C=90°,a=4,b=3,则sinA的值是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102712452502311/SYS201311031027124525023008_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102712452502311/SYS201311031027124525023008_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102712452502311/SYS201311031027124525023008_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102712452502311/SYS201311031027124525023008_ST/3.png)
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在RT△ABC中,∠C=90°,∠A、∠B、∠C的对边分别为a、b、c,则下列式子一定成立的是( )
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在Rt△ABC中,∠C=90°,下列式子不一定成立的是( )
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在Rt△ABC中,若∠C=90°,AC=1,BC=2,则下列结论中正确的是( )
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A.
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B.
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C.
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D.
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