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曲线在店(1,3)处的切线的斜角为 A.30° B.45° C.60° D.12...

曲线6ec8aac122bd4f6e在店(1,3)处的切线的斜角为

       A.30°          B.45°           C.60°           D.12°

 

 

B 【解析】略
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