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【简答题】
已知扇形的半径为5cm,圆心角为150°,求扇形的弧长. (结果保留5位有效数字)
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反馈参考答案：
举一反三
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外擦制霉菌素
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积极抗炎治疗
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Rome in Italy
B.
London in the UK
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Versailles in France
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Vasilievsky.
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