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【简答题】
变速器的变速传动机构的主要作用是改变（）。
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皮皮学刷刷变学霸
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【简答题】二次函数图像上任意点P(x,f(x))关于y轴对称的点P'(-x,f(x))与图像上的点P''(-x,f(-x))是____________________关系。
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