采用高低点法求得维修成本在相关范围内的函数表述式为：y=84000+1.20x，其中，x代表机器工作小时。在相关范围内，以下说法正确的有( )。 A．除高点、低点以外的其他已知数据也满足上述表达式 B．上式表明，维修成本中不随机器工作小时变化的部分是84000元 C．去掉高点或低点，将得到不同的结果 D．上式表明，机器工作每增加一个小时，维修成本将增加1.20元_现代管理学_全学科试题题库

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