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九年级数学：圆中BD∥OC，若∠C=36°，求∠DOC等于多少度？
九年级数学：圆中BD∥OC，若∠C=36°，求∠DOC等于多少度？
初中数学，圆的计算和证明，垂径定理，圆周角圆心角，切线，扇形32/233
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