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2019中考数学一轮复习第一部分教材同步复习第六章圆第23讲圆的相关概念及性质权威预测.doc

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1第一部分 第六章 第 23 讲1如图，在半径为 4 的 O 中，弦 AB OC， BOC30，则 AB 的长为( D )A2 B2 3C4 D4 32如图， AB 是 O 的直径， C， D 为圆上两点若 AOC130，则 D 等于( B )A20 B25C35 D50

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