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(2010•东营)如图,将三角尺的直角顶点放在直尺的一边上,∠1=30°,∠2=...
(2010•东营)如图,将三角尺的直角顶点放在直尺的一边上,∠1=30°,∠2=50°,则∠3的度数等于( )
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A.50°
B.30°
C.20°
D.15°
考点分析:
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