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初师函授试用课本《数学》中,数轴的定义是:“规定了原点、正方向和长度单位的直线叫数轴。”这里的“长度单位”应改为“单位长度”。因为长度单位是一种计量单位,它是公制长度单位米、分米…和市制长度单位丈,尺、寸…的统称。而单位长度则是取一定的长度作为一个单位,有几个这样的长度就是几个单位。新编《初级中学数学课本代数第一册》也指
In the Mathematics for Beginners correspondence test, the definition of the number axis is: “The straight line that defines the origin, the positive direction and the length unit is called the number axis.” The “unit of length” here should be changed to “unit length”. Because the unit of length is a unit of measure, it is the general term for units of metric length in meters, in decimeters ... and in terms of units of length in the municipal system. The unit length is to take a certain length as a unit, there are several such length is a few units. New “junior high school math textbook algebra Volume I” also refers