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如图,在Rt△ABC中,∠C=90°,∠A=30°,E为AB上一点且AE:EB=...
如图,在Rt△ABC中,∠C=90°,∠A=30°,E为AB上一点且AE:EB=4:1,EF⊥AC于F,连接FB,则tan∠CFB的值等于( )
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A.A
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B.
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C.
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D.
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如图,坡角为30°的斜坡上两树间的水平距离AC为2m,则两树间的坡面距离AB为( )
A.4m
B.
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C.
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m
D.
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m
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如图,小明在打网球时,使球恰好能打过网,而且落点恰好在离网6米的位置上,则球拍击球的高度h为( )
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A.
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B.1
C.
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D.
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如图,已知∠ACB=∠CBD=90°,BC=a,AC=b,当CD=( )时,△CDB∽△ABC.
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A.
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B.
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C.
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D.
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如图,每个小正方形边长均为1,则下列图中的三角形(阴影部分)与左图中△ABC相似的是( )
A.
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B.
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C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000527523326825/SYS201311030005275233268006_ST/images3.png)
D.
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如果方程组
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只有一个实数解,那么m的值为( )
A.
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B.
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C.-1
D.0
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