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亲爱的小朋友,你都知道哪些长度单位?我知道一些常见事物的长度:大拇(mǔ)指的宽度大约是1厘米。图钉的长度大约是1厘米。一年级同学的身高大约是1米。二年级同学的步长大约是30厘米。我还知道,1米=100厘米。线段的长度是可以量(liánɡ)出来的。用尺子量,要将物体的左端(duān)对准尺子的“0”刻度,再看右端对着刻度几。我有一把刻度已经磨损(mó sǔn)的尺子,上面只剩(shènɡ)下4个刻度。用我这把尺子,可以直接量出哪些长度?
Dear children, do you know what length units? I know the length of some common things: thumb (mǔ) refers to the width of about 1 cm. Thumbtack length is about 1 cm. The first grade students are about 1 meter tall. The sophomore’s step size is about 30 cm. I also know that 1 meter = 100 centimeters. The length of the line segment can be liánɡ out. With a ruler, align the left side of the ruler with the “0” scale of the ruler and the right side with a few degrees to the scale. I have a ruler on the scale that wears down, leaving only four scales on it. With my ruler, which can be measured directly?