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如图,AB是⊙O直径,∠AOC=130°,则∠D=( ) A.65° B.25°...
如图,AB是⊙O直径,∠AOC=130°,则∠D=( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160844655641933/SYS201310221608446556419008_ST/images0.png)
A.65°
B.25°
C.15°
D.35°
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D.菱形的对角线相等且互相平分
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如图所示,在菱形ABCD中,AC、BD相交于点O,E为AB中点,若OE=3,则菱形ABCD的周长是( )
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如图,是一水库大坝横断面的一部分,坝高h=6m,迎水斜坡AB=10m,斜坡的坡角为α,则tanα的值为( )
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A.
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B.
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C.
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D.
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A.
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B.
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D.
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,那么tanA等于( )
A.
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B.
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C.
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D.
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