刻度尺是测量长度的常用工具．根据不同的需要刻度尺又做成多种，如木尺、钢尺、三角板、皮卷尺等．有些刻度尺，同学们虽然已经见过和用过，但是，要做到正确使用，还必须掌握以下几点：1．认第一，认清刻度尺的零刻线，即测量的起始刻度线．一般刻度尺的零刻线位置有两种．一 Scale is a common tool for measuring length. According to different needs, the scale is made into many kinds, such as wooden ruler, steel ruler, triangle plate, leather tape measure and so on. Some scales, although the students have seen and used, but to achieve correct use, must also grasp the following points: 1. Recognize the first, recognize the zero-scale line of the scale, that is, the starting tick of the measurement. There are two types of zero scale lines in general scales. one