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下列说法正确的是( ) A.所有的菱形都相似 B.所有的矩形都相似 C.所有的正...
下列说法正确的是( )
A.所有的菱形都相似
B.所有的矩形都相似
C.所有的正方形都相似
D.所有的梯形都相似
考点分析:
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C.
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D.
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如图,△ABC中,∠C=90°,AB=5,AC=3,则sinB=( )
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B.
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C.
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D.
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下列计算正确的是( )
A.
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+
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=
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B.
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=0
C.
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•
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km?
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